Tanguy Leroux be9292cac6
[Test] Add full cluster restart test for Rollup (#31533)
This pull request adds a full cluster restart test for a Rollup job. 
The test creates and starts a Rollup job on the cluster and checks 
that the job already exists and is correctly started on the upgraded 
cluster.

This test allows to test that the persistent task state is correctly 
parsed from the cluster state after the upgrade, as the status field 
has been renamed to state in #31031.

The test undercovers a ClassCastException that can be thrown in 
the RollupIndexer when the timestamp as a very low value that fits 
into an integer. When it's the case, the value is parsed back as an 
Integer instead of Long object and (long) position.get(rollupFieldName) 
fails.
2018-06-26 10:07:25 +02:00
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