--- layout: default title: Stats parent: Index APIs nav_order: 72 --- # Index Stats **Introduced 1.0** {: .label .label-purple } 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. {: .note} ## Path and HTTP methods ```json GET /_stats GET //_stats GET //_stats/ ``` ## Path parameters The following table lists the available path parameters. All path parameters are optional. | Parameter | Data type | Description | | :--- | :--- | :--- | | `` | String | A comma-separated list of indexes, data streams, or index aliases used to filter results. Supports wildcard expressions. Defaults to `_all` (`*`). `` | String | A comma-separated list of metric groups that will be included in the response. For valid values, see [Metrics](#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 ```json GET /testindex/_stats ``` {% include copy-curl.html %} #### 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 {: .text-delta} ```json { "_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, "pressure" : { "total_rejections" : 0 } }, "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, "pressure" : { "total_rejections" : 0 } }, "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, "pressure" : { "total_rejections" : 0 } }, "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, "pressure" : { "total_rejections" : 0 } }, "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 ```json GET /testindex1,testindex2/_stats ``` {% include copy-curl.html %} #### Example request: Wildcard expression ```json GET /testindex*/_stats ``` {% include copy-curl.html %} #### Example request: Specific stats ```json GET /testindex/_stats/refresh,flush ``` {% include copy-curl.html %} #### Example request: Expand wildcards ```json GET /testindex*/_stats?expand_wildcards=open,hidden ``` {% include copy-curl.html %} #### Example request: Shard-level statistics ```json GET /testindex/_stats?level=shards ``` {% include copy-curl.html %} ## Concurrent segment search Starting in OpenSearch 2.10, [concurrent segment search]({{site.url}}{{site.baseurl}}/search-plugins/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]({{site.url}}{{site.baseurl}}/search-plugins/concurrent-segment-search#enabling-the-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]({{site.url}}{{site.baseurl}}/search-plugins/concurrent-segment-search#searching-segments-concurrently). 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. |