//lcawley Verified example output 2017-04
[[ml-update-datafeed]]
==== Update {dfeeds-cap}

The update {dfeed} API enables you to update certain properties of a {dfeed}.

===== Request

`POST _xpack/ml/datafeeds/<feed_id>/_update`

//===== Description

===== Path Parameters

`feed_id` (required)::
  (string) Identifier for the {dfeed}

===== Request Body

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

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

`chunking_config`::
  (object) Specifies how data searches are split into time chunks.
  See <<ml-datafeed-chunking-config>>.

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

`job_id`::
 (string) A numerical character string that uniquely identifies the job.

`query`::
  (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`::
  (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`::
  (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 {ref}/search-request-script-fields.html[Script Fields].

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

`types`::
  (array) A list of types to search for within the specified indices.
  For example: `["network","sql","kpi"]`.

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


===== Authorization

You must have `manage_ml`, or `manage` cluster privileges to use this API.
For more information, see <<privileges-list-cluster>>.

===== Examples

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

[source,js]
--------------------------------------------------
POST _xpack/ml/datafeeds/datafeed-it-ops-kpi/_update
{
  "query": {
    "term": {
      "level": "error"
    }
  }
}
--------------------------------------------------
// CONSOLE
// TEST[skip:todo]

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

[source,js]
----
{
  "datafeed_id": "datafeed-it-ops-kpi",
  "job_id": "it-ops-kpi",
  "query_delay": "1m",
  "indices": ["it-ops"],
  "types": ["logs"],
  "query": {
    "term": {
      "level": {
        "value": "error",
        "boost": 1
      }
    }
  },
  "scroll_size": 1000,
  "chunking_config": {
    "mode": "auto"
  }
}
----