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Elastic Docs ›Elasticsearch Guide [8.9] ›REST APIs ›Machine learning anomaly detection APIs

Start datafeeds API

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Start datafeeds API

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Starts one or more datafeeds.

Request

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POST _ml/datafeeds/<feed_id>/_start

Prerequisites

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  • Before you can start a datafeed, the anomaly detection job must be open. Otherwise, an error occurs.
  • Requires the manage_ml cluster privilege. This privilege is included in the machine_learning_admin built-in role.

Description

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A datafeed must be started in order to retrieve data from Elasticsearch. A datafeed can be started and stopped multiple times throughout its lifecycle.

If you restart a stopped datafeed, by default it continues processing input data from the next millisecond after it was stopped. If new data was indexed for that exact millisecond between stopping and starting, it will be ignored.

When Elasticsearch security features are enabled, your datafeed remembers which roles the last user to create or update it had at the time of creation/update and runs the query using those same roles. If you provided secondary authorization headers when you created or updated the datafeed, those credentials are used instead.

Path parameters

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<feed_id>
(Required, string) A numerical character string that uniquely identifies the datafeed. This identifier can contain lowercase alphanumeric characters (a-z and 0-9), hyphens, and underscores. It must start and end with alphanumeric characters.

Query parameters

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end

(Optional, string) The time that the datafeed should end, which can be specified by using one of the following formats:

  • ISO 8601 format with milliseconds, for example 2017-01-22T06:00:00.000Z
  • ISO 8601 format without milliseconds, for example 2017-01-22T06:00:00+00:00
  • Milliseconds since the epoch, for example 1485061200000

Date-time arguments using either of the ISO 8601 formats must have a time zone designator, where Z is accepted as an abbreviation for UTC time.

When a URL is expected (for example, in browsers), the + used in time zone designators must be encoded as %2B.

This value is exclusive. If you do not specify an end time, the datafeed runs continuously.

start

(Optional, string) The time that the datafeed should begin, which can be specified by using the same formats as the end parameter. This value is inclusive.

If you do not specify a start time and the datafeed is associated with a new anomaly detection job, the analysis starts from the earliest time for which data is available.

If you restart a stopped datafeed and specify a start value that is earlier than the timestamp of the latest processed record, the datafeed continues from 1 millisecond after the timestamp of the latest processed record.

timeout
(Optional, time) Specifies the amount of time to wait until a datafeed starts. The default value is 20 seconds.

Request body

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You can also specify the query parameters (such as end and start) in the request body.

Response body

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node
(string) The ID of the node that the datafeed was started on. If the datafeed is allowed to open lazily and has not yet been assigned to a node, this value is an empty string.
started
(Boolean) For a successful response, this value is always true. On failure, an exception is returned instead.

Examples

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POST _ml/datafeeds/datafeed-low_request_rate/_start
{
  "start": "2019-04-07T18:22:16Z"
}

When the datafeed starts, you receive the following results:

{
  "started" : true,
  "node" : "node-1"
}
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