David Turner c088bafbbc Wait for events in waitForRelocation ()
Adds a `waitForEvents(Priority.LANGUID)` to the cluster health request in
`ESIntegTestCase#waitForRelocation()` to deal with the case that this health
request returns successfully despite the fact that there is a pending reroute task which
will relocate another shard.

Relates 
Fixes 
2019-08-01 13:47:39 +01:00
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