2aef7e0900
This commit introduces mapping version to index metadata. This value is monotonically increasing and is updated on mapping updates. This will be useful in cross-cluster replication so that we can request mapping updates from the leader only when there is a mapping update as opposed to the strategy we employ today which is to request a mapping update any time there is an index metadata update. As index metadata updates can occur for many reasons other than mapping updates, this leads to some unnecessary requests and work in cross-cluster replication. |
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