Dimitris Athanasiou d3d73ca095 [ML] Remove data that expired their respective retention period (elastic/x-pack-elasticsearch#610)
This PR introduces a service component that is scheduled to run
once per day, around 30 minutes past midnight, local time.
Listeners can be subscribed to the service in order to get notified
when the next service trigger occurs so that they can execute
management tasks.

Currently, there are 2 such listeners: one is performing removal
of results and the other of model snapshots that have expired
their retention period.

Finally, note that the service is only installed on the master
node to ensure there is only one running on the cluster.

Original commit: elastic/x-pack-elasticsearch@c8edb6016a
2017-02-23 11:06:14 +00:00
..