Index stats API

Returns statistics for an index.

GET /twitter/_stats

Request

GET /<index>/_stats/<index-metric>

GET /<index>/_stats

GET /_stats

Description

Use the index stats API to get high-level aggregation and statistics for an index.

By default, the returned statistics are index-level with primaries and total aggregations. primaries are the values for only the primary shards. total are the accumulated values for both primary and replica shards.

To get shard-level statistics, set the level parameter to shards.

When moving to another node, the shard-level statistics for a shard are cleared. Although the shard is no longer part of the node, that node retains any node-level statistics to which the shard contributed.

Path parameters

<index>

(Optional, string) Comma-separated list or wildcard expression of index names used to limit the request.

To retrieve statistics for all indices, use a value of _all or * or omit this parameter.

<index-metric>

(Optional, string) Comma-separated list of metrics used to limit the request. Supported metrics are:

_all
Return all statistics.
completion
Completion suggester statistics.
docs
Number of documents and deleted docs, which have not yet merged out. Index refreshes can affect this statistic.
fielddata
Fielddata 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 statistics. You can include statistics for custom groups by adding an extra groups parameter (search operations can be associated with one or more groups). The groups parameter accepts a comma separated list of group names. Use _all to return statistics for all groups.
segments

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.
suggest
Suggester statistics.
translog
Translog statistics.
warmer
Warmer statistics.

Query parameters

expand_wildcards

(Optional, string) Controls what kind of indices that wildcard expressions can expand to. Valid values are:

all
Expand to open and closed indices.
open
Expand only to open indices.
closed
Expand only to closed indices.
none
Wildcard expressions are not accepted.

Defaults to open.

fields

(Optional, string) Comma-separated list or wildcard expressions of fields to include in the statistics.

Used as the default list unless a specific field list is provided in the completion_fields or fielddata_fields parameters.

completion_fields
(Optional, string) Comma-separated list or wildcard expressions of fields to include in fielddata and suggest statistics.
fielddata_fields
(Optional, string) Comma-separated list or wildcard expressions of fields to include in fielddata statistics.
forbid_closed_indices
(Optional, boolean) If true, statistics are not collected from closed indices. Defaults to true.
groups
(Optional, string) Comma-separated list of search groups to include in the search statistics.
level

(Optional, string) Indicates whether statistics are aggregated at the cluster, index, or shard level.

Valid values are:

  • cluster
  • indices
  • shards
include_segment_file_sizes
(Optional, boolean) If true, the call reports the aggregated disk usage of each one of the Lucene index files (only applies if segment stats are requested). Defaults to false.
include_unloaded_segments
(Optional, boolean) If true, the response includes information from segments that are not loaded into memory. Defaults to false.

Examples

Get statistics for multiple indices

GET /index1,index2/_stats

Get statistics for all indices

GET /_stats

Get specific statistics

The following request returns only the merge and refresh statistics for all indices.

GET /_stats/merge,refresh

Get statistics for specific search groups

The following request returns only search statistics for the group1 and group2 search groups.

GET /_stats/search?groups=group1,group2