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Index Stats

The Index Stats API provides index statistics. For data streams, the API provides statistics for the stream’s backing indexes. By default, the returned statistics are index level. To receive shard-level statistics, set the level parameter to shards.

When a shard moves to a different node, the shard-level statistics for the shard are cleared. Although the shard is no longer part of the node, the node preserves any node-level statistics to which the shard contributed.

Path and HTTP methods

GET /_stats
GET /<index_ids>/_stats
GET /<index_ids>/_stats/<metric>

Path parameters

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

Parameter Data type Description
<index_ids> String A comma-separated list of indexes, data streams, or index aliases used to filter results. Supports wildcard expressions. Defaults to _all (*).
<metric> String A comma-separated list of metric groups that will be included in the response. For valid values, see Metrics. Defaults to all metrics.

Metrics

The following table lists all available metric groups.

Metric Description
_all Return all statistics.
completion Completion suggester statistics.
docs Returns the number of documents and the number of deleted documents that have not yet been merged. Index refresh operations can affect this statistic.
fielddata Field data statistics.
flush Flush statistics.
get Get statistics, including missing stats.
indexing Indexing statistics.
merge Merge statistics.
query_cache Query cache statistics.
refresh Refresh statistics.
request_cache Shard request cache statistics.
search Search statistics, including suggest operation statistics. Search operations can be associated with one or more groups. You can include statistics for custom groups by providing a groups parameter, which accepts a comma-separated list of group names. To return statistics for all groups, use _all.
segments Statistics about memory use of all open segments. If the include_segment_file_sizes parameter is true, this metric includes the aggregated disk usage of each Lucene index file.
store Size of the index in byte units.
translog Translog statistics.
warmer Warmer statistics.

Query parameters

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

Parameter Data type Description
expand_wildcards String Specifies the type of indexes to which wildcard expressions can expand. Supports comma-separated values. Valid values are:
- all: Expand to all open and closed indexes, including hidden indexes.
- open: Expand to open indexes.
- closed: Expand to closed indexes.
- hidden: Include hidden indexes when expanding. Must be combined with open, closed, or both.
- none: Do not accept wildcard expressions.
Default is open.
fields String A comma-separated list or a wildcard expression specifying fields to include in the statistics. Specifies the default field list if neither completion_fields nor fielddata_fields is provided.
completion_fields String A comma-separated list or wildcard expression specifying fields to include in field-level completion statistics.
fielddata_fields String A comma-separated list or wildcard expression specifying fields to include in field-level fielddata statistics.
forbid_closed_indices Boolean Specifies not to collect statistics for closed indexes. Default is true.
groups String A comma-separated list of search groups to include in the search statistics.
level String Specifies the level used to aggregate statistics. Valid values are:
- cluster: Cluster-level statistics.
- indices: Index-level statistics.
- shards: Shard-level statistics.
Default is indices.
include_segment_file_sizes Boolean Specifies whether to report the aggregated disk usage of each Lucene index file. Only applies to segments statistics. Default is false.
include_unloaded_segments Boolean Specifies whether to include information from segments that are not loaded into memory. Default is false.

Example request: One index

GET /testindex/_stats

Example response

By default, the returned statistics are aggregated in the primaries and total aggregations. The primaries aggregation contains statistics for the primary shards. The total aggregation contains statistics for both primary and replica shards. The following is an example Index Stats API response:

Response
{
  "_shards": {
    "total": 2,
    "successful": 1,
    "failed": 0
  },
  "_all": {
    "primaries": {
      "docs": {
        "count": 4,
        "deleted": 0
      },
      "store": {
        "size_in_bytes": 15531,
        "reserved_in_bytes": 0
      },
      "indexing": {
        "index_total": 4,
        "index_time_in_millis": 10,
        "index_current": 0,
        "index_failed": 0,
        "delete_total": 0,
        "delete_time_in_millis": 0,
        "delete_current": 0,
        "noop_update_total": 0,
        "is_throttled": false,
        "throttle_time_in_millis": 0
      },
      "get": {
        "total": 0,
        "time_in_millis": 0,
        "exists_total": 0,
        "exists_time_in_millis": 0,
        "missing_total": 0,
        "missing_time_in_millis": 0,
        "current": 0
      },
      "search": {
        "open_contexts": 0,
        "query_total": 12,
        "query_time_in_millis": 11,
        "query_current": 0,
        "fetch_total": 12,
        "fetch_time_in_millis": 5,
        "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": 0,
        "total_time_in_millis": 0,
        "total_docs": 0,
        "total_size_in_bytes": 0,
        "total_stopped_time_in_millis": 0,
        "total_throttled_time_in_millis": 0,
        "total_auto_throttle_in_bytes": 20971520
      },
      "refresh": {
        "total": 8,
        "total_time_in_millis": 58,
        "external_total": 7,
        "external_total_time_in_millis": 60,
        "listeners": 0
      },
      "flush": {
        "total": 1,
        "periodic": 1,
        "total_time_in_millis": 21
      },
      "warmer": {
        "current": 0,
        "total": 6,
        "total_time_in_millis": 0
      },
      "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": 0,
        "evictions": 0
      },
      "completion": {
        "size_in_bytes": 0
      },
      "segments": {
        "count": 4,
        "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": 0,
        "max_unsafe_auto_id_timestamp": -1,
        "remote_store" : {
          "upload" : {
            "total_upload_size" : {
              "started_bytes" : 152419,
              "succeeded_bytes" : 152419,
              "failed_bytes" : 0
            },
            "refresh_size_lag" : {
              "total_bytes" : 0,
              "max_bytes" : 0
            },
            "max_refresh_time_lag_in_millis" : 0,
            "total_time_spent_in_millis" : 516
          },
          "download" : {
            "total_download_size" : {
              "started_bytes" : 0,
              "succeeded_bytes" : 0,
              "failed_bytes" : 0
            },
            "total_time_spent_in_millis" : 0
          }
        },
        "file_sizes": {}
      },
      "translog": {
        "operations": 0,
        "size_in_bytes": 55,
        "uncommitted_operations": 0,
        "uncommitted_size_in_bytes": 55,
        "earliest_last_modified_age": 142622215,
        "remote_store" : {
          "upload" : {
            "total_uploads" : {
              "started" : 57,
              "failed" : 0,
              "succeeded" : 57
            },
            "total_upload_size" : {
              "started_bytes" : 16830,
              "failed_bytes" : 0,
              "succeeded_bytes" : 16830
            }
          }
        }
      },
      "request_cache": {
        "memory_size_in_bytes": 0,
        "evictions": 0,
        "hit_count": 0,
        "miss_count": 0
      },
      "recovery": {
        "current_as_source": 0,
        "current_as_target": 0,
        "throttle_time_in_millis": 0
      }
    },
    "total": {
      "docs": {
        "count": 4,
        "deleted": 0
      },
      "store": {
        "size_in_bytes": 15531,
        "reserved_in_bytes": 0
      },
      "indexing": {
        "index_total": 4,
        "index_time_in_millis": 10,
        "index_current": 0,
        "index_failed": 0,
        "delete_total": 0,
        "delete_time_in_millis": 0,
        "delete_current": 0,
        "noop_update_total": 0,
        "is_throttled": false,
        "throttle_time_in_millis": 0
      },
      "get": {
        "total": 0,
        "time_in_millis": 0,
        "exists_total": 0,
        "exists_time_in_millis": 0,
        "missing_total": 0,
        "missing_time_in_millis": 0,
        "current": 0
      },
      "search": {
        "open_contexts": 0,
        "query_total": 12,
        "query_time_in_millis": 11,
        "query_current": 0,
        "fetch_total": 12,
        "fetch_time_in_millis": 5,
        "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": 0,
        "total_time_in_millis": 0,
        "total_docs": 0,
        "total_size_in_bytes": 0,
        "total_stopped_time_in_millis": 0,
        "total_throttled_time_in_millis": 0,
        "total_auto_throttle_in_bytes": 20971520
      },
      "refresh": {
        "total": 8,
        "total_time_in_millis": 58,
        "external_total": 7,
        "external_total_time_in_millis": 60,
        "listeners": 0
      },
      "flush": {
        "total": 1,
        "periodic": 1,
        "total_time_in_millis": 21
      },
      "warmer": {
        "current": 0,
        "total": 6,
        "total_time_in_millis": 0
      },
      "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": 0,
        "evictions": 0
      },
      "completion": {
        "size_in_bytes": 0
      },
      "segments": {
        "count": 4,
        "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": 0,
        "max_unsafe_auto_id_timestamp": -1,
        "remote_store" : {
          "upload" : {
            "total_upload_size" : {
              "started_bytes" : 152419,
              "succeeded_bytes" : 152419,
              "failed_bytes" : 0
            },
            "refresh_size_lag" : {
              "total_bytes" : 0,
              "max_bytes" : 0
            },
            "max_refresh_time_lag_in_millis" : 0,
            "total_time_spent_in_millis" : 516
          },
          "download" : {
            "total_download_size" : {
              "started_bytes" : 0,
              "succeeded_bytes" : 0,
              "failed_bytes" : 0
            },
            "total_time_spent_in_millis" : 0
          }
        },
        "file_sizes": {}
      },
      "translog": {
        "operations": 0,
        "size_in_bytes": 55,
        "uncommitted_operations": 0,
        "uncommitted_size_in_bytes": 55,
        "earliest_last_modified_age": 142622215,
        "remote_store" : {
          "upload" : {
            "total_uploads" : {
              "started" : 57,
              "failed" : 0,
              "succeeded" : 57
            },
            "total_upload_size" : {
              "started_bytes" : 16830,
              "failed_bytes" : 0,
              "succeeded_bytes" : 16830
            }
          }
        }
      },
      "request_cache": {
        "memory_size_in_bytes": 0,
        "evictions": 0,
        "hit_count": 0,
        "miss_count": 0
      },
      "recovery": {
        "current_as_source": 0,
        "current_as_target": 0,
        "throttle_time_in_millis": 0
      }
    }
  },
  "indices": {
    "testindex": {
      "uuid": "0SXXSpe9Rp-FpxXXWLOD8Q",
      "primaries": {
        "docs": {
          "count": 4,
          "deleted": 0
        },
        "store": {
          "size_in_bytes": 15531,
          "reserved_in_bytes": 0
        },
        "indexing": {
          "index_total": 4,
          "index_time_in_millis": 10,
          "index_current": 0,
          "index_failed": 0,
          "delete_total": 0,
          "delete_time_in_millis": 0,
          "delete_current": 0,
          "noop_update_total": 0,
          "is_throttled": false,
          "throttle_time_in_millis": 0
        },
        "get": {
          "total": 0,
          "time_in_millis": 0,
          "exists_total": 0,
          "exists_time_in_millis": 0,
          "missing_total": 0,
          "missing_time_in_millis": 0,
          "current": 0
        },
        "search": {
          "open_contexts": 0,
          "query_total": 12,
          "query_time_in_millis": 11,
          "query_current": 0,
          "fetch_total": 12,
          "fetch_time_in_millis": 5,
          "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": 0,
          "total_time_in_millis": 0,
          "total_docs": 0,
          "total_size_in_bytes": 0,
          "total_stopped_time_in_millis": 0,
          "total_throttled_time_in_millis": 0,
          "total_auto_throttle_in_bytes": 20971520
        },
        "refresh": {
          "total": 8,
          "total_time_in_millis": 58,
          "external_total": 7,
          "external_total_time_in_millis": 60,
          "listeners": 0
        },
        "flush": {
          "total": 1,
          "periodic": 1,
          "total_time_in_millis": 21
        },
        "warmer": {
          "current": 0,
          "total": 6,
          "total_time_in_millis": 0
        },
        "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": 0,
          "evictions": 0
        },
        "completion": {
          "size_in_bytes": 0
        },
        "segments": {
          "count": 4,
          "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": 0,
          "max_unsafe_auto_id_timestamp": -1,
          "remote_store" : {
            "upload" : {
              "total_upload_size" : {
                "started_bytes" : 152419,
                "succeeded_bytes" : 152419,
                "failed_bytes" : 0
              },
              "refresh_size_lag" : {
                "total_bytes" : 0,
                "max_bytes" : 0
              },
              "max_refresh_time_lag_in_millis" : 0,
              "total_time_spent_in_millis" : 516
            },
            "download" : {
              "total_download_size" : {
                "started_bytes" : 0,
                "succeeded_bytes" : 0,
                "failed_bytes" : 0
              },
              "total_time_spent_in_millis" : 0
            }
          },
          "file_sizes": {}
        },
        "translog": {
          "operations": 0,
          "size_in_bytes": 55,
          "uncommitted_operations": 0,
          "uncommitted_size_in_bytes": 55,
          "earliest_last_modified_age": 142622215,
          "remote_store" : {
            "upload" : {
              "total_uploads" : {
                "started" : 57,
                "failed" : 0,
                "succeeded" : 57
              },
              "total_upload_size" : {
                "started_bytes" : 16830,
                "failed_bytes" : 0,
                "succeeded_bytes" : 16830
              }
            }
          }
        },
        "request_cache": {
          "memory_size_in_bytes": 0,
          "evictions": 0,
          "hit_count": 0,
          "miss_count": 0
        },
        "recovery": {
          "current_as_source": 0,
          "current_as_target": 0,
          "throttle_time_in_millis": 0
        }
      },
      "total": {
        "docs": {
          "count": 4,
          "deleted": 0
        },
        "store": {
          "size_in_bytes": 15531,
          "reserved_in_bytes": 0
        },
        "indexing": {
          "index_total": 4,
          "index_time_in_millis": 10,
          "index_current": 0,
          "index_failed": 0,
          "delete_total": 0,
          "delete_time_in_millis": 0,
          "delete_current": 0,
          "noop_update_total": 0,
          "is_throttled": false,
          "throttle_time_in_millis": 0
        },
        "get": {
          "total": 0,
          "time_in_millis": 0,
          "exists_total": 0,
          "exists_time_in_millis": 0,
          "missing_total": 0,
          "missing_time_in_millis": 0,
          "current": 0
        },
        "search": {
          "open_contexts": 0,
          "query_total": 12,
          "query_time_in_millis": 11,
          "query_current": 0,
          "fetch_total": 12,
          "fetch_time_in_millis": 5,
          "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": 0,
          "total_time_in_millis": 0,
          "total_docs": 0,
          "total_size_in_bytes": 0,
          "total_stopped_time_in_millis": 0,
          "total_throttled_time_in_millis": 0,
          "total_auto_throttle_in_bytes": 20971520
        },
        "refresh": {
          "total": 8,
          "total_time_in_millis": 58,
          "external_total": 7,
          "external_total_time_in_millis": 60,
          "listeners": 0
        },
        "flush": {
          "total": 1,
          "periodic": 1,
          "total_time_in_millis": 21
        },
        "warmer": {
          "current": 0,
          "total": 6,
          "total_time_in_millis": 0
        },
        "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": 0,
          "evictions": 0
        },
        "completion": {
          "size_in_bytes": 0
        },
        "segments": {
          "count": 4,
          "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": 0,
          "max_unsafe_auto_id_timestamp": -1,
          "remote_store" : {
            "upload" : {
              "total_upload_size" : {
                "started_bytes" : 152419,
                "succeeded_bytes" : 152419,
                "failed_bytes" : 0
              },
              "refresh_size_lag" : {
                "total_bytes" : 0,
                "max_bytes" : 0
              },
              "max_refresh_time_lag_in_millis" : 0,
              "total_time_spent_in_millis" : 516
            },
            "download" : {
              "total_download_size" : {
                "started_bytes" : 0,
                "succeeded_bytes" : 0,
                "failed_bytes" : 0
              },
              "total_time_spent_in_millis" : 0
            }
          },
          "file_sizes": {}
        },
        "translog": {
          "operations": 0,
          "size_in_bytes": 55,
          "uncommitted_operations": 0,
          "uncommitted_size_in_bytes": 55,
          "earliest_last_modified_age": 142622215,
          "remote_store" : {
            "upload" : {
              "total_uploads" : {
                "started" : 57,
                "failed" : 0,
                "succeeded" : 57
              },
              "total_upload_size" : {
                "started_bytes" : 16830,
                "failed_bytes" : 0,
                "succeeded_bytes" : 16830
              }
            }
          }
        },
        "request_cache": {
          "memory_size_in_bytes": 0,
          "evictions": 0,
          "hit_count": 0,
          "miss_count": 0
        },
        "recovery": {
          "current_as_source": 0,
          "current_as_target": 0,
          "throttle_time_in_millis": 0
        }
      }
    }
  }
}

Example request: Comma-separated list of indexes

GET /testindex1,testindex2/_stats

Example request: Wildcard expression

GET /testindex*/_stats

Example request: Specific stats

GET /testindex/_stats/refresh,flush

Example request: Expand wildcards

GET /testindex*/_stats?expand_wildcards=open,hidden

Example request: Shard-level statistics

GET /testindex/_stats?level=shards

Starting in OpenSearch 2.10, concurrent segment search allows each shard-level request to search segments in parallel during the query phase. If you enable the experimental concurrent segment search feature flag, the Index Stats API response will contain several additional fields with statistics about slices (units of work executed by a thread). These fields will be provided whether or not the cluster and index settings for concurrent segment search are enabled. For more information about slices, see Concurrent segment search.

The following table provides information about the added response fields.

Response field Description
search.concurrent_avg_slice_count The average slice count of all search requests. This is computed as the total slice count divided by the total number of concurrent search requests.
search.concurrent_query_total The total number of query operations that use concurrent segment search.
search.concurrent_query_time_in_millis The total amount of time taken by all query operations that use concurrent segment search, in milliseconds.
search.concurrent_query_current The number of currently running query operations that use concurrent segment search.
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