Upgrade job snapshot API

Upgrades a previously stored machine learning model snapshot to the current major version. It accepts an UpgradeJobModelSnapshotRequest object and responds with an UpgradeJobModelSnapshotResponse object.

Upgrade job snapshots request

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A UpgradeJobModelSnapshotRequest requires the following arguments:

UpgradeJobModelSnapshotRequest request = new UpgradeJobModelSnapshotRequest(
    jobId, 
    snapshotId, 
    TimeValue.timeValueMinutes(30), 
    true);

	The job that owns the snapshot
	The snapshot id to upgrade
	The time out of the request. When `wait_for_completion` is `false` the timeout value is applied to the time it takes for the task to be assigned to a node. When `wait_for_completion` is `true` this timeout applies for the whole upgrade process. The default value is `30m`
	When true, this causes the request to not return until the upgrade is complete. Otherwise, the response returns as soon as the task is assigned to a node. The default is false.

Upgrade job snapshot response

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A UpgradeJobModelSnapshotResponse contains information on if the request was completed and its assigned node.

boolean completed = response.isCompleted(); 
String node = response.getNode();

	Was the upgrade completed
	What is the assigned node if the task is not completed

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