[role="xpack"]
[testenv="platinum"]
[[ml-update-datafeed]]
=== Update {dfeeds} API

[subs="attributes"]
++++
<titleabbrev>Update {dfeeds}</titleabbrev>
++++

Updates certain properties of a {dfeed}.

[[ml-update-datafeed-request]]
==== {api-request-title}

`POST _ml/datafeeds/<feed_id>/_update`

[[ml-update-datafeed-prereqs]]
==== {api-prereq-title}

* If {es} {security-features} are enabled, you must have `manage_ml`, or `manage`
cluster privileges to use this API. See
{stack-ov}/security-privileges.html[Security privileges].

[[ml-update-datafeed-desc]]
==== {api-description-title}

If you update the `delayed_data_check_config` property, you must stop and
start the {dfeed} for the change to be applied.

IMPORTANT: When {es} {security-features} are enabled, your {dfeed} remembers
which roles the user who updated it had at the time of update and runs the query
using those same roles.

[[ml-update-datafeed-path-parms]]
==== {api-path-parms-title}

`<feed_id>`::
  (Required, string) Identifier for the {dfeed}.

[[ml-update-datafeed-request-body]]
==== {api-request-body-title}

The following properties can be updated after the {dfeed} is created:

`aggregations`::
  (Optional, object) If set, the {dfeed} performs aggregation searches. For more
  information, see <<ml-datafeed-resource>>.

`chunking_config`::
  (Optional, object) Specifies how data searches are split into time chunks. See
  <<ml-datafeed-chunking-config>>.
  
`delayed_data_check_config`::
  (Optional, object) Specifies whether the data feed checks for missing data and 
  the size of the window. See <<ml-datafeed-delayed-data-check-config>>.  

`frequency`::
  (Optional, time units) The interval at which scheduled queries are made while
  the {dfeed} runs in real time. The default value is either the bucket span for
  short bucket spans, or, for longer bucket spans, a sensible fraction of the
  bucket span. For example: `150s`.

`indices`::
  (Optional, array) An array of index names. Wildcards are supported. For
  example: `["it_ops_metrics", "server*"]`.

`job_id`::
 (Optional, string) A numerical character string that uniquely identifies the
 {anomaly-job}.

`query`::
  (Optional, object) The {es} query domain-specific language (DSL). This value
  corresponds to the query object in an {es} search POST body. All the options
  that are supported by {es} can be used, as this object is passed verbatim to
  {es}. By default, this property has the following value:
  `{"match_all": {"boost": 1}}`.

`query_delay`::
  (Optional, time units) The number of seconds behind real-time that data is
  queried. For example, if data from 10:04 a.m. might not be searchable in {es}
  until 10:06 a.m., set this property to 120 seconds. The default value is `60s`.

`script_fields`::
  (Optional, object) Specifies scripts that evaluate custom expressions and
  returns script fields to the {dfeed}. The
  <<ml-detectorconfig,detector configuration objects>> in a job can contain
  functions that use these script fields. For more information, see
  <<request-body-search-script-fields,Script fields>>.

`scroll_size`::
  (Optional, unsigned integer) The `size` parameter that is used in {es}
  searches. The default value is `1000`.

For more information about these properties,
see <<ml-datafeed-resource>>.

[[ml-update-datafeed-example]]
==== {api-examples-title}

The following example updates the query for the `datafeed-total-requests`
{dfeed} so that only log entries of error level are analyzed:

[source,js]
--------------------------------------------------
POST _ml/datafeeds/datafeed-total-requests/_update
{
  "query": {
    "term": {
      "level": "error"
    }
  }
}
--------------------------------------------------
// CONSOLE
// TEST[skip:setup:server_metrics_datafeed]

When the {dfeed} is updated, you receive the full {dfeed} configuration with
with the updated values:

[source,js]
----
{
  "datafeed_id": "datafeed-total-requests",
  "job_id": "total-requests",
  "query_delay": "83474ms",
  "indices": ["server-metrics"],
  "query": {
    "term": {
      "level": {
        "value": "error",
        "boost": 1.0
      }
    }
  },
  "scroll_size": 1000,
  "chunking_config": {
    "mode": "auto"
  }
}
----
// TESTRESPONSE[s/"query.boost": "1.0"/"query.boost": $body.query.boost/]
