Nodes stats

The nodes stats API returns statistics about your cluster.

Path and HTTP methods

GET /_nodes/stats
GET /_nodes/<node_id>/stats
GET /_nodes/stats/<metric>
GET /_nodes/<node_id>/stats/<metric>
GET /_nodes/stats/<metric>/<index_metric>
GET /_nodes/<node_id>/stats/<metric>/<index_metric>

Path parameters

The following table lists the available path parameters. All path parameters are optional.

Parameter	Type	Description
nodeId	String	A comma-separated list of nodeIds used to filter results. Supports node filters. Defaults to `_all`.
metric	String	A comma-separated list of metric groups that will be included in the response. For example, `jvm,fs`. See the list of all metrics below. Defaults to all metrics.
index_metric	String	A comma-separated list of index metric groups that will be included in the response. For example, `docs,store`. See the list of all index metrics below. Defaults to all index metrics.

The following table lists all available metric groups.

Metric	Description
indices	Index statistics, such as size, document count, and search, index, and delete times for documents.
os	Statistics about the host OS, including load, memory, and swapping.
process	Statistics about processes, including their memory consumption, open file descriptors, and CPU usage.
jvm	Statistics about the JVM, including memory pool, buffer pool, and garbage collection, and the number of loaded classes.
fs	File system statistics, such as read/write statistics, data path, and free disk space.
transport	Transport layer statistics about send/receive in cluster communication.
http	Statistics about the HTTP layer.
breaker	Statistics about the field data circuit breakers.
script	Statistics about scripts, such as compilations and cache evictions.
discovery	Statistics about cluster states.
ingest	Statistics about ingest pipelines.
adaptive_selection	Statistics about adaptive replica selection, which selects an eligible node using shard allocation awareness.
script_cache	Statistics about script cache.
indexing_pressure	Statistics about the node’s indexing pressure.
shard_indexing_pressure	Statistics about shard indexing pressure.

To filter the information returned for the indices metric, you can use specific index_metric values. You can use these only when you use the following query types:

GET _nodes/stats/
GET _nodes/stats/_all
GET _nodes/stats/indices

The following index metrics are supported:

docs
store
indexing
get
search
merge
refresh
flush
warmer
query_cache
fielddata
completion
segments
translog
request_cache

For example, the following query requests statistics for docs and search:

GET _nodes/stats/indices/docs,search

Query parameters

The following table lists the available query parameters. All query parameters are optional.

Parameter	Type	Description
completion_fields	String	The fields to include in completion statistics. Supports comma-separated lists and wildcard expressions.
fielddata_fields	String	The fields to include in fielddata statistics. Supports comma-separated lists and wildcard expressions.
fields	String	The fields to include. Supports comma-separated lists and wildcard expressions.
groups	String	A comma-separated list of search groups to include in the search statistics.
level	String	Specifies whether statistics are aggregated at the cluster, index, or shard level. Valid values are `indices`, `node`, and `shard`.
timeout	Time	Sets the time limit for node response. Default is `30s`.
include_segment_file_sizes	Boolean	If segment statistics are requested, this field specifies to return the aggregated disk usage of every Lucene index file. Default is `false`.

Example request

GET _nodes/stats/

Example response

{
  "_nodes" : {
    "total" : 1,
    "successful" : 1,
    "failed" : 0
  },
  "cluster_name" : "docker-cluster",
  "nodes" : {
    "F-ByTQzVQ3GQeYzQJArJGQ" : {
      "timestamp" : 1664484195257,
      "name" : "opensearch",
      "transport_address" : "127.0.0.1:9300",
      "host" : "127.0.0.1",
      "ip" : "127.0.0.1:9300",
      "roles" : [
        "cluster_manager",
        "data",
        "ingest",
        "remote_cluster_client"
      ],
      "attributes" : {
        "shard_indexing_pressure_enabled" : "true"
      },
      "indices" : {
        "docs" : {
          "count" : 13160,
          "deleted" : 12
        },
        "store" : {
          "size_in_bytes" : 6263461,
          "reserved_in_bytes" : 0
        },
        "indexing" : {
          "index_total" : 0,
          "index_time_in_millis" : 0,
          "index_current" : 0,
          "index_failed" : 0,
          "delete_total" : 204,
          "delete_time_in_millis" : 427,
          "delete_current" : 0,
          "noop_update_total" : 0,
          "is_throttled" : false,
          "throttle_time_in_millis" : 0
        },
        "get" : {
          "total" : 4,
          "time_in_millis" : 18,
          "exists_total" : 4,
          "exists_time_in_millis" : 18,
          "missing_total" : 0,
          "missing_time_in_millis" : 0,
          "current" : 0
        },
        "search" : {
          "open_contexts": 4,
          "query_total": 194,
          "query_time_in_millis": 467,
          "query_current": 0,
          "fetch_total": 194,
          "fetch_time_in_millis": 143,
          "fetch_current": 0,
          "scroll_total": 0,
          "scroll_time_in_millis": 0,
          "scroll_current": 0,
          "point_in_time_total": 0,
          "point_in_time_time_in_millis": 0,
          "point_in_time_current": 0,
          "suggest_total": 0,
          "suggest_time_in_millis": 0,
          "suggest_current": 0
        },
        "merges" : {
          "current" : 0,
          "current_docs" : 0,
          "current_size_in_bytes" : 0,
          "total" : 1,
          "total_time_in_millis" : 5,
          "total_docs" : 12,
          "total_size_in_bytes" : 3967,
          "total_stopped_time_in_millis" : 0,
          "total_throttled_time_in_millis" : 0,
          "total_auto_throttle_in_bytes" : 251658240
        },
        "refresh" : {
          "total" : 74,
          "total_time_in_millis" : 201,
          "external_total" : 57,
          "external_total_time_in_millis" : 314,
          "listeners" : 0
        },
        "flush" : {
          "total" : 28,
          "periodic" : 28,
          "total_time_in_millis" : 1261
        },
        "warmer" : {
          "current" : 0,
          "total" : 45,
          "total_time_in_millis" : 99
        },
        "query_cache" : {
          "memory_size_in_bytes" : 0,
          "total_count" : 0,
          "hit_count" : 0,
          "miss_count" : 0,
          "cache_size" : 0,
          "cache_count" : 0,
          "evictions" : 0
        },
        "fielddata" : {
          "memory_size_in_bytes" : 356,
          "evictions" : 0
        },
        "completion" : {
          "size_in_bytes" : 0,
          "fields" : { }
        },
        "segments" : {
          "count" : 17,
          "memory_in_bytes" : 0,
          "terms_memory_in_bytes" : 0,
          "stored_fields_memory_in_bytes" : 0,
          "term_vectors_memory_in_bytes" : 0,
          "norms_memory_in_bytes" : 0,
          "points_memory_in_bytes" : 0,
          "doc_values_memory_in_bytes" : 0,
          "index_writer_memory_in_bytes" : 0,
          "version_map_memory_in_bytes" : 0,
          "fixed_bit_set_memory_in_bytes" : 288,
          "max_unsafe_auto_id_timestamp" : -1,
          "file_sizes" : { }
        },
        "translog" : {
          "operations" : 12,
          "size_in_bytes" : 1452,
          "uncommitted_operations" : 12,
          "uncommitted_size_in_bytes" : 1452,
          "earliest_last_modified_age" : 164160
        },
        "request_cache" : {
          "memory_size_in_bytes" : 1649,
          "evictions" : 0,
          "hit_count" : 0,
          "miss_count" : 18
        },
        "recovery" : {
          "current_as_source" : 0,
          "current_as_target" : 0,
          "throttle_time_in_millis" : 0
        }
      },
      "os" : {
        "timestamp" : 1664484195263,
        "cpu" : {
          "percent" : 0,
          "load_average" : {
            "1m" : 0.0,
            "5m" : 0.0,
            "15m" : 0.0
          }
        },
        "mem" : {
          "total_in_bytes" : 13137076224,
          "free_in_bytes" : 9265442816,
          "used_in_bytes" : 3871633408,
          "free_percent" : 71,
          "used_percent" : 29
        },
        "swap" : {
          "total_in_bytes" : 4294967296,
          "free_in_bytes" : 4294967296,
          "used_in_bytes" : 0
        },
        "cgroup" : {
          "cpuacct" : {
            "control_group" : "/",
            "usage_nanos" : 338710071600
          },
          "cpu" : {
            "control_group" : "/",
            "cfs_period_micros" : 100000,
            "cfs_quota_micros" : -1,
            "stat" : {
              "number_of_elapsed_periods" : 0,
              "number_of_times_throttled" : 0,
              "time_throttled_nanos" : 0
            }
          },
          "memory" : {
            "control_group" : "/",
            "limit_in_bytes" : "9223372036854771712",
            "usage_in_bytes" : "1432346624"
          }
        }
      },
      "process" : {
        "timestamp" : 1664484195263,
        "open_file_descriptors" : 556,
        "max_file_descriptors" : 65536,
        "cpu" : {
          "percent" : 0,
          "total_in_millis" : 170870
        },
        "mem" : {
          "total_virtual_in_bytes" : 6563344384
        }
      },
      "jvm" : {
        "timestamp" : 1664484195264,
        "uptime_in_millis" : 21232111,
        "mem" : {
          "heap_used_in_bytes" : 308650480,
          "heap_used_percent" : 57,
          "heap_committed_in_bytes" : 536870912,
          "heap_max_in_bytes" : 536870912,
          "non_heap_used_in_bytes" : 147657128,
          "non_heap_committed_in_bytes" : 152502272,
          "pools" : {
            "young" : {
              "used_in_bytes" : 223346688,
              "max_in_bytes" : 0,
              "peak_used_in_bytes" : 318767104,
              "peak_max_in_bytes" : 0,
              "last_gc_stats" : {
                "used_in_bytes" : 0,
                "max_in_bytes" : 0,
                "usage_percent" : -1
              }
            },
            "old" : {
              "used_in_bytes" : 67068928,
              "max_in_bytes" : 536870912,
              "peak_used_in_bytes" : 67068928,
              "peak_max_in_bytes" : 536870912,
              "last_gc_stats" : {
                "used_in_bytes" : 34655744,
                "max_in_bytes" : 536870912,
                "usage_percent" : 6
              }
            },
            "survivor" : {
              "used_in_bytes" : 18234864,
              "max_in_bytes" : 0,
              "peak_used_in_bytes" : 32721280,
              "peak_max_in_bytes" : 0,
              "last_gc_stats" : {
                "used_in_bytes" : 18234864,
                "max_in_bytes" : 0,
                "usage_percent" : -1
              }
            }
          }
        },
        "threads" : {
          "count" : 80,
          "peak_count" : 80
        },
        "gc" : {
          "collectors" : {
            "young" : {
              "collection_count" : 18,
              "collection_time_in_millis" : 199
            },
            "old" : {
              "collection_count" : 0,
              "collection_time_in_millis" : 0
            }
          }
        },
        "buffer_pools" : {
          "mapped" : {
            "count" : 23,
            "used_in_bytes" : 6232113,
            "total_capacity_in_bytes" : 6232113
          },
          "direct" : {
            "count" : 63,
            "used_in_bytes" : 9050069,
            "total_capacity_in_bytes" : 9050068
          },
          "mapped - 'non-volatile memory'" : {
            "count" : 0,
            "used_in_bytes" : 0,
            "total_capacity_in_bytes" : 0
          }
        },
        "classes" : {
          "current_loaded_count" : 20693,
          "total_loaded_count" : 20693,
          "total_unloaded_count" : 0
        }
      },
      "thread_pool" : {
        "OPENSEARCH_ML_TASK_THREAD_POOL" : {
          "threads" : 0,
          "queue" : 0,
          "active" : 0,
          "rejected" : 0,
          "largest" : 0,
          "completed" : 0
        },
        "ad-batch-task-threadpool" : {
          "threads" : 0,
          "queue" : 0,
          "active" : 0,
          "rejected" : 0,
          "largest" : 0,
          "completed" : 0
        },
        ...
      },
      "fs" : {
        "timestamp" : 1664484195264,
        "total" : {
          "total_in_bytes" : 269490393088,
          "free_in_bytes" : 261251477504,
          "available_in_bytes" : 247490805760
        },
        "data" : [
          {
            "path" : "/usr/share/opensearch/data/nodes/0",
            "mount" : "/ (overlay)",
            "type" : "overlay",
            "total_in_bytes" : 269490393088,
            "free_in_bytes" : 261251477504,
            "available_in_bytes" : 247490805760
          }
        ],
        "io_stats" : { }
      },
      "transport" : {
        "server_open" : 0,
        "total_outbound_connections" : 0,
        "rx_count" : 0,
        "rx_size_in_bytes" : 0,
        "tx_count" : 0,
        "tx_size_in_bytes" : 0
      },
      "http" : {
        "current_open" : 5,
        "total_opened" : 1108
      },
      "breakers" : {
        "request" : {
          "limit_size_in_bytes" : 322122547,
          "limit_size" : "307.1mb",
          "estimated_size_in_bytes" : 0,
          "estimated_size" : "0b",
          "overhead" : 1.0,
          "tripped" : 0
        },
        "fielddata" : {
          "limit_size_in_bytes" : 214748364,
          "limit_size" : "204.7mb",
          "estimated_size_in_bytes" : 356,
          "estimated_size" : "356b",
          "overhead" : 1.03,
          "tripped" : 0
        },
        "in_flight_requests" : {
          "limit_size_in_bytes" : 536870912,
          "limit_size" : "512mb",
          "estimated_size_in_bytes" : 0,
          "estimated_size" : "0b",
          "overhead" : 2.0,
          "tripped" : 0
        },
        "parent" : {
          "limit_size_in_bytes" : 510027366,
          "limit_size" : "486.3mb",
          "estimated_size_in_bytes" : 308650480,
          "estimated_size" : "294.3mb",
          "overhead" : 1.0,
          "tripped" : 0
        }
      },
      "script" : {
        "compilations" : 0,
        "cache_evictions" : 0,
        "compilation_limit_triggered" : 0
      },
      "discovery" : {
        "cluster_state_queue" : {
          "total" : 0,
          "pending" : 0,
          "committed" : 0
        },
        "published_cluster_states" : {
          "full_states" : 2,
          "incompatible_diffs" : 0,
          "compatible_diffs" : 10
        }
      },
      "ingest" : {
        "total" : {
          "count" : 0,
          "time_in_millis" : 0,
          "current" : 0,
          "failed" : 0
        },
        "pipelines" : { }
      },
      "adaptive_selection" : {
        "F-ByTQzVQ3GQeYzQJArJGQ" : {
          "outgoing_searches" : 0,
          "avg_queue_size" : 0,
          "avg_service_time_ns" : 501024,
          "avg_response_time_ns" : 794105,
          "rank" : "0.8"
        }
      },
      "script_cache" : {
        "sum" : {
          "compilations" : 0,
          "cache_evictions" : 0,
          "compilation_limit_triggered" : 0
        },
        "contexts" : [
          {
            "context" : "aggregation_selector",
            "compilations" : 0,
            "cache_evictions" : 0,
            "compilation_limit_triggered" : 0
          },
          {
            "context" : "aggs",
            "compilations" : 0,
            "cache_evictions" : 0,
            "compilation_limit_triggered" : 0
          },
          ...
        ]
      },
      "indexing_pressure" : {
        "memory" : {
          "current" : {
            "combined_coordinating_and_primary_in_bytes" : 0,
            "coordinating_in_bytes" : 0,
            "primary_in_bytes" : 0,
            "replica_in_bytes" : 0,
            "all_in_bytes" : 0
          },
          "total" : {
            "combined_coordinating_and_primary_in_bytes" : 40256,
            "coordinating_in_bytes" : 40256,
            "primary_in_bytes" : 45016,
            "replica_in_bytes" : 0,
            "all_in_bytes" : 40256,
            "coordinating_rejections" : 0,
            "primary_rejections" : 0,
            "replica_rejections" : 0
          },
          "limit_in_bytes" : 53687091
        }
      },
      "shard_indexing_pressure" : {
        "stats" : { },
        "total_rejections_breakup_shadow_mode" : {
          "node_limits" : 0,
          "no_successful_request_limits" : 0,
          "throughput_degradation_limits" : 0
        },
        "enabled" : false,
        "enforced" : false
      }
    }
  }
}

Response fields

The following table lists all response fields.

Field	Data type	Description
_nodes	Object	Statistics about the nodes that are returned.
_nodes.total	Integer	The total number of nodes for this request.
_nodes.successful	Integer	The number of nodes for which the request was successful.
_nodes.failed	Integer	The number of nodes for which the request failed. If there are nodes for which the request failed, the failure message is included.
cluster_name	String	The name of the cluster.
nodes	Object	Statistics for the nodes included in this request.

`nodes`

The nodes object contains all nodes that are returned by the request, along with their IDs. Each node has the following properties.

Field	Data type	Description
timestamp	Integer	The time the nodes statistics were collected, in milliseconds since the epoch.
name	String	The name of the node.
transport_address	IP address	The host and port of the transport layer that is used by nodes in a cluster to communicate internally.
host	IP address	The network host of the node.
ip	IP address	The IP address and port of the node.
roles	Array	The roles of the node (for example, `cluster_manager`, `data`, or `ingest`).
attributes	Object	The attributes of the node (for example, `shard_indexing_pressure_enabled`).
indices	Object	Index statistics for each index that has shards on the node.
os	Object	Statistics about the OS for the node.
process	Object	Process statistics for the node.
jvm	Object	Statistics about the JVM for the node.
thread_pool	Object	Statistics about each thread pool for the node.
fs	Object	Statistics about the file stores for the node.
transport	Object	Transport statistics for the node.
http	Object	HTTP statistics for the node.
http.current_open	Integer	The number of currently open HTTP connections for the node.
http.total_opened	Integer	The total number of HTTP connections the node has opened since it started.
breakers	Object	Statistics about the circuit breakers for the node.
script	Object	Script statistics for the node.
script_cache	Object	Script cache statistics for the node.
discovery	Object	Node discovery statistics for the node.
ingest	Object	Ingest statistics for the node.
adaptive_selection	Object	Statistics about adaptive selections for the node.
indexing_pressure	Object	Statistics related to the node’s indexing pressure.
shard_indexing_pressure	Object	Statistics related to indexing pressure at the shard level.
search_backpressure	Object	Statistics related to search backpressure.

`indices`

The indices object contains the index statistics for each index with shards on this node. Each index has the following properties.

Field	Field type	Description
docs	Object	Document statistics for all primary shards that exist on the node.
docs.count	Integer	The number of documents reported by Lucene. Excludes deleted documents and recently indexed documents that are not yet assigned to a segment. Nested documents are counted separately.
docs.deleted	Integer	The number of deleted documents reported by Lucene. Excludes recent deletion operations that have not yet affect the segment.
store	Object	Statistics about the shard sizes of the shards on the node.
store.size_in_bytes	Integer	Total size of all shards on the node.
store.reserved_in_bytes	Integer	The predicted number of bytes the shard store will grow to be because of activities such as restoring snapshots and peer recoveries.
indexing	Object	Statistics about indexing operations for the node.
indexing.index_total	Integer	The total number of indexing operations on the node.
indexing.index_time_in_millis	Integer	The total time for all indexing operations, in milliseconds.
indexing.index_current	Integer	The number of indexing operations that are currently running.
indexing.index_failed	Integer	The number of indexing operations that have failed.
indexing.delete_total	Integer	The total number of deletions.
indexing.delete_time_in_millis	Integer	The total time for all deletion operations, in milliseconds.
indexing.delete_current	Integer	The number of deletion operations that are currently running.
indexing.noop_update_total	Integer	The total number of noop operations.
indexing.is_throttled	Boolean	Specifies whether any operations were throttled.
indexing.throttle_time_in_millis	Integer	The total time for throttling operations, in milliseconds.
get	Object	Statistics about the get operations for the node.
get.total	Integer	The total number of get operations.
get.time_in_millis	Integer	The total time for all get operations, in milliseconds.
get.exists_total	Integer	The total number of successful get operations.
get.exists_time_in_millis	Integer	The total time for all successful get operations, in milliseconds.
get.missing_total	Integer	The number of failed get operations.
get.missing_time_in_millis	Integer	The total time for all failed get operations, in milliseconds.
get.current	Integer	The number of get operations that are currently running.
search	Object	Statistics about the search operations for the node.
search.point_in_time_total	Integer	The total number of Point in Time contexts that have been created (completed and active) since the node last restarted.
search.point_in_time_time_in_millis	Integer	The amount of time that Point in Time contexts have been held open since the node last restarted, in milliseconds.
search.point_in_time_current	Integer	The number of Point in Time contexts currently open.
search.open_contexts	Integer	The number of open search contexts.
search.query_total	Integer	The total number of query operations.
search.query_time_in_millis	Integer	The total time for all query operations, in milliseconds.
search.query_current	Integer	The number of query operations that are currently running.
search.fetch_total	Integer	The total number of fetch operations.
search.fetch_time_in_millis	Integer	The total time for all fetch operations, in milliseconds.
search.fetch_current	Integer	The number of fetch operations that are currently running.
search.scroll_total	Integer	The total number of scroll operations.
search.scroll_time_in_millis	Integer	The total time for all scroll operations, in milliseconds.
search.scroll_current	Integer	The number of scroll operations that are currently running.
search.suggest_total	Integer	The total number of suggest operations.
search.suggest_time_in_millis	Integer	The total time for all suggest operations, in milliseconds.
search.suggest_current	Integer	The number of suggest operations that are currently running.
merges	Object	Statistics about merge operations for the node.
merges.current	Integer	The number of merge operations that are currently running.
merges.current_docs	Integer	The number of document merges that are currently running.
merges.current_size_in_bytes	Integer	The memory size, in bytes, that is used to perform current merge operations.
merges.total	Integer	The total number of merge operations.
merges.total_time_in_millis	Integer	The total time for merges, in milliseconds.
merges.total_docs	Integer	The total number of documents that have been merged.
merges.total_size_in_bytes	Integer	The total size of all merged documents, in bytes.
merges.total_stopped_time_in_millis	Integer	The total time spent on stopping merge operations, in milliseconds.
merges.total_throttled_time_in_millis	Integer	The total time spent on throttling merge operations, in milliseconds.
merges.total_auto_throttle_in_bytes	Integer	The total size of automatically throttled merge operations, in bytes.
refresh	Object	Statistics about refresh operations for the node.
refresh.total	Integer	The total number of refresh operations.
refresh.total_time_in_millis	Integer	The total time for all refresh operations, in milliseconds.
refresh.external_total	Integer	The total number of external refresh operations.
refresh.external_total_time_in_millis	Integer	The total time for all external refresh operations, in milliseconds.
refresh.listeners	Integer	The number of refresh listeners.
flush	Object	Statistics about flush operations for the node.
flush.total	Integer	The total number of flush operations.
flush.periodic	Integer	The total number of periodic flush operations.
flush.total_time_in_millis	Integer	The total time for all flush operations, in milliseconds.
warmer	Object	Statistics about the index warming operations for the node.
warmer.current	Integer	The number of current index warming operations.
warmer.total	Integer	The total number of index warming operations.
warmer.total_time_in_millis	Integer	The total time for all index warming operations, in milliseconds.
query_cache	Statistics about query cache operations for the node.
query_cache.memory_size_in_bytes	Integer	The amount of memory used for the query cache for all shards in the node.
query_cache.total_count	Integer	The total number of hits, misses, and cached queries in the query cache.
query_cache.hit_count	Integer	The total number of hits in the query cache.
query_cache.miss_count	Integer	The total number of misses in the query cache.
query_cache.cache_size	Integer	The size of the query cache, in bytes.
query_cache.cache_count	Integer	The number of queries in the query cache.
query_cache.evictions	Integer	The number of evictions in the query cache.
fielddata	Object	Statistics about the field data cache for all shards in the node.
fielddata.memory_size_in_bytes	Integer	The total amount of memory used for the field data cache for all shards in the node.
fielddata.evictions	Integer	The number of evictions in the field data cache.
fielddata.fields	Object	Contains all field data fields.
completion	Object	Statistics about completions for all shards in the node.
completion.size_in_bytes	Integer	The total amount of memory used for completion for all shards in the node, in bytes.
completion.fields	Object	Contains completion fields.
segments	Object	Statistics about segments for all shards in the node.
segments.count	Integer	The total number of segments.
segments.memory_in_bytes	Integer	The total amount of memory, in bytes.
segments.terms_memory_in_bytes	Integer	The total amount of memory used for terms, in bytes.
segments.stored_fields_memory_in_bytes	Integer	The total amount of memory used for stored fields, in bytes.
segments.term_vectors_memory_in_bytes	Integer	The total amount of memory used for term vectors, in bytes.
segments.norms_memory_in_bytes	Integer	The total amount of memory used for normalization factors, in bytes.
segments.points_memory_in_bytes	Integer	The total amount of memory used for points, in bytes.
segments.doc_values_memory_in_bytes	Integer	The total amount of memory used for doc values, in bytes.
segments.index_writer_memory_in_bytes	Integer	The total amount of memory used by all index writers, in bytes.
segments.version_map_memory_in_bytes	Integer	The total amount of memory used by all version maps, in bytes.
segments.fixed_bit_set_memory_in_bytes	Integer	The total amount of memory used by fixed bit sets, in bytes. Fixed bit sets are used for nested objects and join fields.
segments.max_unsafe_auto_id_timestamp	Integer	The timestamp for the most recently retired indexing request, in milliseconds since the epoch.
segments.file_sizes	Integer	Statistics about the size of the segment files.
translog	Object	Statistics about transaction log operations for the node.
translog.operations	Integer	The number of translog operations.
translog.size_in_bytes	Integer	The size of the translog, in bytes.
translog.uncommitted_operations	Integer	The number of uncommitted translog operations.
translog.uncommitted_size_in_bytes	Integer	The size of uncommitted translog operations, in bytes.
translog.earliest_last_modified_age	Integer	The earliest last modified age for the translog.
request_cache	Object	Statistics about the request cache for the node.
request_cache.memory_size_in_bytes	Integer	The memory size used by the request cache, in bytes.
request_cache.evictions	Integer	The number of request cache evictions.
request_cache.hit_count	Integer	The number of request cache hits.
request_cache.miss_count	Integer	The number of request cache misses.
recovery	Object	Statistics about recovery operations for the node.
recovery.current_as_source	Integer	The number of recovery operations that have used an index shard as a source.
recovery.current_as_target	Integer	The number of recovery operations that have used an index shard as a target.
recovery.throttle_time_in_millis	Integer	The delay of recovery operations due to throttling, in milliseconds.

`os`

The os object has the OS statistics for the node and has the following properties.

Field	Field type	Description
timestamp	Integer	The last refresh time for the OS statistics, in milliseconds since the epoch.
cpu	Object	Statistics about the node’s CPU usage.
cpu.percent	Integer	Recent CPU usage for the system.
cpu.load_average	Object	Statistics about load averages for the system.
cpu.load_average.1m	Float	The load average for the system for the time period of one minute.
cpu.load_average.5m	Float	The load average for the system for the time period of five minutes.
cpu.load_average.15m	Float	The load average for the system for the time period of 15 minutes.
cpu.mem	Object	Statistics about memory usage for the node.
cpu.mem.total_in_bytes	Integer	The total amount of physical memory, in bytes.
cpu.mem.free_in_bytes	Integer	The total amount of free physical memory, in bytes.
cpu.mem.used_in_bytes	Integer	The total amount of used physical memory, in bytes.
cpu.mem.free_percent	Integer	The percentage of memory that is free.
cpu.mem.used_percent	Integer	The percentage of memory that is used.
cpu.swap	Object	Statistics about swap space for the node.
cpu.swap.total_in_bytes	Integer	The total amount of swap space, in bytes.
cpu.swap.free_in_bytes	Integer	The total amount of free swap space, in bytes.
cpu.swap.used_in_bytes	Integer	The total amount of used swap space, in bytes.
cpu.cgroup	Object	Contains cgroup statistics for the node. Returned for Linux only.
cpu.cgroup.cpuacct	Object	Statistics about the cpuacct control group for the node.
cpu.cgroup.cpu	Object	Statistics about the CPU control group for the node.
cpu.cgroup.memory	Object	Statistics about the memory control group for the node.

`process`

The process object contains process statistics for the node and has the following properties.

Field	Field type	Description
timestamp	Integer	The last refresh time for the process statistics, in milliseconds since the epoch.
open_file_descriptors	Integer	The number of opened file descriptors associated with the current process.
max_file_descriptors	Integer	The maximum number of file descriptors for the system.
cpu	Object	Statistics about the CPU for the node.
cpu.percent	Integer	The percentage of CPU usage for the process.
cpu.total_in_millis	Integer	The total CPU time used by the process on which the JVM is running, in milliseconds.
mem	Object	Statistics about the memory for the node.
mem.total_virtual_in_bytes	Integer	The total amount of virtual memory that is guaranteed to be available to the process that is currently running, in bytes.

`jvm`

The jvm object contains statistics about the JVM for the node and has the following properties.

Field	Field type	Description
timestamp	Integer	The last refresh time for the JVM statistics, in milliseconds since the epoch.
uptime_in_millis	Integer	The JVM uptime, in milliseconds.
mem	Object	Statistics for the JVM memory usage on the node.
mem.heap_used_in_bytes	Integer	The amount of memory that is currently being used, in bytes.
mem.heap_used_percent	Integer	The percentage of memory that is currently used by the heap.
mem.heap_committed_in_bytes	Integer	The amount of memory available for use by the heap, in bytes.
mem.heap_max_in_bytes	Integer	The maximum amount of memory available for use by the heap, in bytes.
mem.non_heap_used_in_bytes	Integer	The amount of non-heap memory that is currently used, in bytes.
mem.non_heap_committed_in_bytes	Integer	The maximum amount of non-heap memory available for use, in bytes.
mem.pools	Object	Statistics about heap memory usage for the node.
mem.pools.young	Object	Statistics about the young generation heap memory usage for the node. Contains the amount of memory used, the maximum amount of memory available, and the peak amount of memory used.
mem.pools.old	Object	Statistics about the old generation heap memory usage for the node. Contains the amount of memory used, the maximum amount of memory available, and the peak amount of memory used.
mem.pools.survivor	Object	Statistics about the survivor space memory usage for the node. Contains the amount of memory used, the maximum amount of memory available, and the peak amount of memory used.
threads	Object	Statistics about the JVM thread usage for the node.
threads.count	Integer	The number of threads that are currently active in the JVM.
threads.peak_count	Integer	The maximum number of threads in the JVM.
gc.collectors	Object	Statistics about the JVM garbage collectors for the node.
gc.collectors.young	Integer	Statistics about JVM garbage collectors that collect young generation objects.
gc.collectors.young.collection_count	Integer	The number of garbage collectors that collect young generation objects.
gc.collectors.young.collection_time_in_millis	Integer	The total time spent on garbage collection of young generation objects, in milliseconds.
gc.collectors.old	Integer	Statistics about JVM garbage collectors that collect old generation objects.
gc.collectors.old.collection_count	Integer	The number of garbage collectors that collect old generation objects.
gc.collectors.old.collection_time_in_millis	Integer	The total time spent on garbage collection of old generation objects, in milliseconds.
buffer_pools	Object	Statistics about the JVM buffer pools for the node.
buffer_pools.mapped	Object	Statistics about the mapped JVM buffer pools for the node.
buffer_pools.mapped.count	Integer	The number of mapped buffer pools.
buffer_pools.mapped.used_in_bytes	Integer	The amount of memory used by mapped buffer pools, in bytes.
buffer_pools.mapped.total_capacity_in_bytes	Integer	The total capacity of the mapped buffer pools, in bytes.
buffer_pools.direct	Object	Statistics about the direct JVM buffer pools for the node.
buffer_pools.direct.count	Integer	The number of direct buffer pools.
buffer_pools.direct.used_in_bytes	Integer	The amount of memory used by direct buffer pools, in bytes.
buffer_pools.direct.total_capacity_in_bytes	Integer	The total capacity of the direct buffer pools, in bytes.
classes	Object	Statistics about the classes loaded by the JVM for the node.
classes.current_loaded_count	Integer	The number of classes currently loaded by the JVM.
classes.total_loaded_count	Integer	The total number of classes loaded by the JVM since it started.
classes.total_unloaded_count	Integer	The total number of classes unloaded by the JVM since it started.

`thread_pool`

The thread_pool object contains a list of all thread pools. Each thread pool is a nested object specified by its ID with the properties listed below.

Field	Field type	Description
threads	Integer	The number of threads in the pool.
queue	Integer	The number of threads in queue.
active	Integer	The number of active threads in the pool.
rejected	Integer	The number of tasks that have been rejected.
largest	Integer	The peak number of threads in the pool.
completed	Integer	The number of tasks completed.

`fs`

The fs object represents statistics about the file stores for the node. It has the following properties.

Field	Field type	Description
timestamp	Integer	The last refresh time for the file store statistics, in milliseconds since the epoch.
total	Object	Statistics for all file stores of the node.
total.total_in_bytes	Integer	The total memory size of all file stores, in bytes.
total.free_in_bytes	Integer	The total unallocated disk space in all file stores, in bytes.
total.available_in_bytes	Integer	The total disk space available to the JVM on all file stores. Represents the actual amount of memory, in bytes, that OpenSearch can use.
data	Array	The list of all file stores. Each file store has the properties listed below.
data.path	String	The path to the file store.
data.mount	String	The mount point of the file store.
data.type	String	The type of the file store (for example, overlay).
data.total_in_bytes	Integer	The total size of the file store, in bytes.
data.free_in_bytes	Integer	The total unallocated disk space in the file store, in bytes.
data.available_in_bytes	Integer	The total amount of disk space available to the JVM for the file store, in bytes.
io_stats	Object	I/O statistics for the node (Linux only). Includes devices, read and write operations, and the I/O operation time.

`transport`

The transport object has the following properties.

Field	Field type	Description
server_open	Integer	The number of open inbound TCP connections that OpenSearch nodes use for internal communication.
total_outbound_connections	Integer	The total number of outbound transport connections that the node has opened since it started.
rx_count	Integer	The total number of RX (receive) packets the node received during internal communication.
rx_size_in_bytes	Integer	The total size of RX packets the node received during internal communication, in bytes.
tx_count	Integer	The total number of TX (transmit) packets the node sent during internal communication.
tx_size_in_bytes	Integer	The total size of TX (transmit) packets the node sent during internal communication, in bytes.

`breakers`

The breakers object contains statistics about the circuit breakers for the node. Each circuit breaker is a nested object listed by name and contains the following properties.

Field	Field type	Description
limit_size_in_bytes	Integer	The memory limit for the circuit breaker, in bytes.
limit_size	Byte value	The memory limit for the circuit breaker in human-readable format (for example, `307.1mb`).
estimated_size_in_bytes	Integer	The estimated memory used for the operation, in bytes.
estimated_size	Byte value	The estimated memory used for the operation in human-readable format (for example, `356b`).
overhead	Float	A factor that all estimates are multiplied by to calculate the final estimate.
tripped	Integer	The total number of times the circuit breaker has been activated to prevent an out-of-memory error.

`script` and `script_cache`

The script and script_cache objects have the following properties.

Field	Field type	Description
script	Object	Script statistics for the node.
script.compilations	Integer	The total number of script compilations for the node.
script.cache_evictions	Integer	The total number of times the script cache has purged old data.
script.compilation_limit_triggered	Integer	The total number of times script compilation was limited by a circuit breaker.
script_cache	Object	Script cache statistics for the node.
script_cache.sum.compilations	Integer	The total number of script compilations in the cache for the node.
script_cache.sum.cache_evictions	Integer	The total number of times the script cache has purged old data.
script_cache.sum.compilation_limit_triggered	Integer	The total number of times script compilation in the cache was limited by a circuit breaker.
script_cache.contexts	Array of objects	The list of contexts for the script cache. Each context contains its name, the number of compilations, the number of cache evictions, and the number of times the script was limited by a circuit breaker.

`discovery`

The discovery object contains the node discovery statistics and has the following properties.

Field	Field type	Description
cluster_state_queue	Object	Cluster state queue statistics for the node.
cluster_state_queue.total	Integer	The total number of cluster states in the queue.
cluster_state_queue.pending	Integer	The number of pending cluster states in the queue.
cluster_state_queue.committed	Integer	The number of committed cluster states in the queue.
published_cluster_states	Object	Statistics for the published cluster states for the node.
published_cluster_states.full_states	Integer	The number of published cluster states.
published_cluster_states.incompatible_diffs	Integer	The number of incompatible differences between published cluster states.
published_cluster_states.compatible_diffs	Integer	The number of compatible differences between published cluster states.

`ingest`

The ingest object contains the ingest statistics and has the following properties.

Field	Field type	Description
total	Integer	Ingest statistics for the node’s lifetime.
total.count	Integer	The total number of documents ingested by the node.
total.time_in_millis	Integer	The total amount of time for preprocessing ingest documents, in milliseconds.
total.current	Integer	The total number of documents that are currently being ingested by the node.
total.failed	Integer	The total number of failed ingestions for the node.
pipelines	Object	Ingest pipeline statistics for the node. Each pipeline is a nested object specified by its ID with the properties listed below.
pipelines.id.count	Integer	The number of documents preprocessed by the ingest pipeline.
pipelines.id.time_in_millis	Integer	The total amount of time for preprocessing documents in the ingest pipeline, in milliseconds.
pipelines.id.failed	Integer	The total number of failed ingestions for the ingest pipeline.
pipelines.id.processors	Array of objects	Statistics for the ingest processors. Includes the number of documents that are currently transformed, the total number of transformed documents, the number of failed transformations, and the time spent transforming documents.

`adaptive_selection`

The adaptive_selection object contains the adaptive selection statistics. Each entry is specified by the node ID and has the properties listed below.

Field	Field type	Description
outgoing_searches	Integer	The number of outgoing search requests for the node.
avg_queue_size	Integer	The rolling average queue size of search requests for the node (exponentially weighted).
avg_service_time_ns	Integer	The rolling average service time for search requests, in nanoseconds (exponentially weighted).
avg_response_time_ns	Integer	The rolling average response time for search requests, in nanoseconds (exponentially weighted).
rank	String	The node’s rank that is used to select shards when routing requests.

`indexing_pressure`

The indexing_pressure object contains the indexing pressure statistics and has the following properties.

Field	Field type	Description
memory	Object	Statistics related to memory consumption for the indexing load.
memory.current	Object	Statistics related to memory consumption for the current indexing load.
memory.current.combined_coordinating_and_primary_in_bytes	Integer	The total memory used by indexing requests in the coordinating or primary stages, in bytes. A node can reuse the coordinating memory if the primary stage is run locally, so the total memory does not necessarily equal the sum of the coordinating and primary stage memory usage.
memory.current.coordinating_in_bytes	The total memory consumed by indexing requests in the coordinating stage, in bytes.
memory.current.primary_in_bytes	Integer	The total memory consumed by indexing requests in the primary stage, in bytes.
memory.current.replica_in_bytes	Integer	The total memory consumed by indexing requests in the replica stage, in bytes.
memory.current.all_in_bytes	Integer	The total memory consumed by indexing requests in the coordinating, primary, or replica stages.

`shard_indexing_pressure`

The shard_indexing_pressure object contains the shard indexing pressure statistics and has the following properties.

Field	Field type	Description
stats	Object	Statistics about shard indexing pressure.
total_rejections_breakup_shadow_mode	Object	If running in shadow mode, the `total_rejections_breakup_shadow_mode` object contains statistics about the request rejection criteria of all shards in the node.
total_rejections_breakup_shadow_mode.node_limits	Integer	The total number of rejections due to the node memory limit. When all shards reach the memory limit assigned to the node (for example, 10% of heap size), the shard is unable to take in more traffic on the node, and the indexing request is rejected.
total_rejections_breakup_shadow_mode.no_successful_request_limits	Integer	The total number of rejections when the node occupancy level is breaching its soft limit and the shard has multiple outstanding requests that are waiting to be executed. In this case, additional indexing requests are rejected until the system recovers.
total_rejections_breakup_shadow_mode.throughput_degradation_limits	Integer	The total number of rejections when the node occupancy level is breaching its soft limit and there is a constant deterioration in the request turnaround at the shard level. In this case, additional indexing requests are rejected until the system recovers.
enabled	Boolean	Specifies whether the shard indexing pressure feature is turned on for the node.
enforced	Boolean	If true, the shard indexing pressure runs in enforced mode (there are rejections). If false, the shard indexing pressure runs in shadow mode (there are no rejections, but statistics are recorded and can be retrieved in the `total_rejections_breakup_shadow_mode` object). Only applicable if shard indexing pressure is enabled.

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If you use the security plugin, make sure you have the appropriate permissions: cluster:monitor/nodes/stats.

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Documentation

Nodes stats

Path and HTTP methods

Path parameters

Query parameters

Example request

Example response

Response fields

`nodes`

`indices`

`os`

`process`

`jvm`

`thread_pool`

`fs`

`transport`

`breakers`

`script` and `script_cache`

`discovery`

`ingest`

`adaptive_selection`

`indexing_pressure`

`shard_indexing_pressure`

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Documentation

Nodes stats

Path and HTTP methods

Path parameters

Query parameters

Example request

Example response

Response fields

nodes

indices

os

process

jvm

thread_pool

fs

transport

breakers

script and script_cache

discovery

ingest

adaptive_selection

indexing_pressure

shard_indexing_pressure

Required permissions

`nodes`

`indices`

`os`

`process`

`jvm`

`thread_pool`

`fs`

`transport`

`breakers`

`script` and `script_cache`

`discovery`

`ingest`

`adaptive_selection`

`indexing_pressure`

`shard_indexing_pressure`