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The shard changes api returns the minimum IndexMetadata version the leader index needs to have. If the leader side is behind on IndexMetadata version then follow shard task waits with processing write operations until the mapping has been fetched from leader index and applied in follower index in the background. The cluster state api is used to fetch the leader mapping and put mapping api to apply the mapping in the follower index. This works because put mapping api accepts fields that are already defined. Relates to #30086