Remove a comma in doc to make example a valid json.

This will help reader to do a hurry up copy-paste test.
Merge pull request #3767 from gtt116/master

Remove a comma in doc to make example a valid json.
Update Operation might hang (rarely) when retrying on invalid shard state
The retry logic when failing does not reset the operation started flag...
closes #3769
improve search while relocation
- add verification phase at the end of the test
- add explicit test for 0 replicas and 1 replica
Moved RecoverAfterNodesTests to inherit from AbstractIntegrationTest