Nhat Nguyen 47cfc25fa0 Skip update if leader and follower settings identical (#44535)
If the setting on the follower and the leader are identical after
filtering out private and internal settings, then we should not call
update setting (on the follower) as there's nothing to change. Moreover,
this makes the ShardFollowTask abort as it considers
ActionRequestValidationException (caused by an empty update setting
request) as a fatal error.

Closes #44521
2019-07-18 11:08:45 -04:00
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