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
Concurrent segment search
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. |