//lcawley Verified example output 2017-04-11
[[ml-update-snapshot]]
==== Update Model Snapshots

The update model snapshot API enables you to update certain properties of a snapshot.

===== Request

`POST _xpack/ml/anomaly_detectors/<job_id>/model_snapshots/<snapshot_id>/_update`


===== Description

//TBD. Is the following still true?

Updates to the configuration are only applied after the job has been closed
and new data has been sent to it.

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

===== Path Parameters

`job_id` (required)::
  (string) Identifier for the job

`snapshot_id` (required)::
  (string) Identifier for the model snapshot

===== Request Body

The following properties can be updated after the model snapshot is created:

`description`::
  (string) An optional description of the model snapshot.

`retain`::
  (boolean) TBD.

////
===== Responses

TBD
200
(EmptyResponse) The cluster has been successfully deleted
404
(BasicFailedReply) The cluster specified by {cluster_id} cannot be found (code: clusters.cluster_not_found)
412
(BasicFailedReply) The Elasticsearch cluster has not been shutdown yet (code: clusters.cluster_plan_state_error)
////

===== Examples

The following example updates the snapshot identified as `1491852978`:

[source,js]
--------------------------------------------------
POST
_xpack/ml/anomaly_detectors/it_ops_new_logs/model_snapshots/1491852978/_update
{
  "description": "Snapshot 1",
  "retain": true
}
--------------------------------------------------
// CONSOLE
// TEST[skip:todo]

When the snapshot is updated, you receive the following results:
----
{
  "acknowledged": true,
  "model": {
    "job_id": "it_ops_new_logs",
    "timestamp": 1491852978000,
    "description": "Snapshot 1",
...
    "retain": true
  }
}
----