elasticsearch/docs/reference/rollup/apis/start-job.asciidoc

[role="xpack"]
[[rollup-start-job]]
=== Start {rollup-jobs} API
[subs="attributes"]
++++
<titleabbrev>Start {rollup-jobs}</titleabbrev>
++++

Starts an existing, stopped {rollup-job}.

experimental[]

NOTE: For version 8.5 and above we recommend <<downsampling,downsampling>> over
rollups as a way to reduce your storage costs for time series data.

[[rollup-start-job-request]]
==== {api-request-title}

`POST _rollup/job/<job_id>/_start`

[[rollup-start-job-prereqs]]
==== {api-prereq-title}

* If the {es} {security-features} are enabled, you must have `manage` or
`manage_rollup` cluster privileges to use this API. For more information, see
<<security-privileges>>.

[[rollup-start-job-desc]]
==== {api-description-title}

If you try to start a job that does not exist, an exception occurs. If you try
to start a job that is already started, nothing happens.

[[rollup-start-job-path-params]]
==== {api-path-parms-title}

`<job_id>`::
  (Required, string) Identifier for the {rollup-job}.
  
[[rollup-start-job-response-codes]]
==== {api-response-codes-title}

 `404` (Missing resources)::
 This code indicates that there are no resources that match the request. It
 occurs if you try to start a job that doesn't exist.

[[rollup-start-job-examples]]
==== {api-examples-title}

If we have already created a {rollup-job} named `sensor`, it can be started with:

[source,console]
--------------------------------------------------
POST _rollup/job/sensor/_start
--------------------------------------------------
// TEST[setup:sensor_rollup_job]

Which will return the response:

[source,console-result]
----
{
  "started": true
}
----