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There are two issues regarding the way that we sync mapping from leader to follower when a ccr restore is completed: 1. The returned mapping from a cluster service might not be up to date as the mapping of the restored index commit. 2. We should not compare the mapping version of the follower and the leader. They are not related to one another. Moreover, I think we should only ensure that once the restore is done, the mapping on the follower should be at least the mapping of the copied index commit. We don't have to sync the mapping which is updated after we have opened a session. Relates #36879 Closes #37887