[role="xpack"]
[[data-stream-stats-api]]
=== Data stream stats API
++++
<titleabbrev>Data stream stats</titleabbrev>
++++

Retrieves statistics for one or more <<data-streams,data streams>>.

////
[source,console]
----
PUT /_index_template/template
{
  "index_patterns": ["my-data-stream*"],
  "data_stream": { }
}

PUT /my-data-stream/_bulk?refresh
{"create":{ }}
{ "@timestamp": "2020-12-08T11:04:05.000Z" }
{"create":{ }}
{ "@timestamp": "2020-12-08T11:06:07.000Z" }
{"create":{ }}
{ "@timestamp": "2020-12-09T11:07:08.000Z" }

POST /my-data-stream/_rollover/
POST /my-data-stream/_rollover/

PUT /my-data-stream-two/_bulk?refresh
{"create":{ }}
{ "@timestamp": "2020-12-08T11:04:05.000Z" }
{"create":{ }}
{ "@timestamp": "2020-12-08T11:06:07.000Z" }

POST /my-data-stream-two/_rollover/
----
// TESTSETUP
////

////
[source,console]
----
DELETE /_data_stream/*
DELETE /_index_template/*
----
// TEARDOWN
////

[source,console]
----
GET /_data_stream/my-data-stream/_stats
----

[[data-stream-stats-api-prereqs]]
==== {api-prereq-title}

* If the {es} {security-features} are enabled, you must have the
`monitor` or `manage` <<privileges-list-indices,index privilege>>
for the data stream.

[[data-stream-stats-api-request]]
==== {api-request-title}

`GET /_data_stream/<data-stream>/_stats`


[[data-stream-stats-api-path-params]]
==== {api-path-parms-title}

`<data-stream>`::
(Optional, string)
Comma-separated list of data streams used to limit the request. Wildcard
expressions (`*`) are supported.
+
To target all data streams in a cluster, omit this parameter or use `*`.

[[data-stream-stats-api-query-params]]
==== {api-query-parms-title}

include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=ds-expand-wildcards]
+
Defaults to `open`.

`human`::
(Optional, Boolean)
If `true`, the response includes statistics in human-readable <<byte-units,byte
values>>. Defaults to `false`.


[role="child_attributes"]
[[data-stream-stats-api-response-body]]
==== {api-response-body-title}

`_shards`::
(object)
Contains information about shards that attempted to execute the request.
+
.Properties of `_shards`
[%collapsible%open]
====
`total`::
(integer)
Total number of shards that attempted to execute the request.

`successful`::
(integer)
Number of shards that successfully executed the request.

`failed`::
(integer)
Number of shards that failed to execute the request.
====

`data_stream_count`::
(integer)
Total number of selected data streams.

`backing_indices`::
(integer)
Total number of backing indices for the selected data streams.

`total_store_sizes`::
(<<byte-units,byte value>>)
Total size of all shards for the selected data streams.
This property is included only if the `human` query parameter is `true`.

`total_store_size_bytes`::
(integer)
Total size, in bytes, of all shards for the selected data streams.

`data_streams`::
(array of objects)
Contains statistics for the selected data streams.
+
.Properties of objects in `data_streams`
[%collapsible%open]
====
`data_stream`::
(string)
Name of the data stream.

`backing_indices`::
(integer)
Current number of backing indices for the data stream.

`store_size`::
(<<byte-units,byte value>>)
Total size of all shards for the data stream's backing indices.
This parameter is only returned if the `human` query parameter is `true`.

`store_size_bytes`::
(integer)
Total size, in bytes, of all shards for the data stream's backing indices.

`maximum_timestamp`::
(integer)
The data stream's highest `@timestamp` value, converted to milliseconds since
the {wikipedia}/Unix_time[Unix epoch].
+
[NOTE]
=====
This timestamp is provided as a best effort. The data stream may contain
`@timestamp` values higher than this if one or more of the following conditions
are met:

* The stream contains <<indices-open-close,closed>> backing indices.
* Backing indices with a <<data-streams-generation,lower generation>> contain
higher `@timestamp` values.
=====
====

[[data-stream-stats-api-example]]
==== {api-examples-title}

[source,console]
----
GET /_data_stream/my-data-stream*/_stats?human=true
----

The API returns the following response.

[source,console-result]
----
{
  "_shards": {
    "total": 10,
    "successful": 5,
    "failed": 0
  },
  "data_stream_count": 2,
  "backing_indices": 5,
  "total_store_size": "7kb",
  "total_store_size_bytes": 7268,
  "data_streams": [
    {
      "data_stream": "my-data-stream",
      "backing_indices": 3,
      "store_size": "3.7kb",
      "store_size_bytes": 3772,
      "maximum_timestamp": 1607512028000
    },
    {
      "data_stream": "my-data-stream-two",
      "backing_indices": 2,
      "store_size": "3.4kb",
      "store_size_bytes": 3496,
      "maximum_timestamp": 1607425567000
    }
  ]
}
----
// TESTRESPONSE[s/"total_store_size": "7kb"/"total_store_size": $body.total_store_size/]
// TESTRESPONSE[s/"total_store_size_bytes": 7268/"total_store_size_bytes": $body.total_store_size_bytes/]
// TESTRESPONSE[s/"store_size": "3.7kb"/"store_size": $body.data_streams.0.store_size/]
// TESTRESPONSE[s/"store_size_bytes": 3772/"store_size_bytes": $body.data_streams.0.store_size_bytes/]
// TESTRESPONSE[s/"store_size": "3.4kb"/"store_size": $body.data_streams.1.store_size/]
// TESTRESPONSE[s/"store_size_bytes": 3496/"store_size_bytes": $body.data_streams.1.store_size_bytes/]
