//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? - not sure but close/open would be the method
Updates to the configuration are only applied after the job has been closed
and re-opened.


==== 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. For example,
  "Before black friday".

`retain`::
  (boolean) If true, this snapshot will not be deleted during automatic cleanup
  of snapshots older than `model_snapshot_retention_days`.
  Note that this snapshot will still be deleted when the job is deleted.
  The default value is false.


==== 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 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:
[source,js]
----
{
  "acknowledged": true,
  "model": {
    "job_id": "it_ops_new_logs",
    "timestamp": 1491852978000,
    "description": "Snapshot 1",
...
    "retain": true
  }
}
----