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Operation sets last propagated timestamp,
https://github.com/apache/kudu/blob/branch-1.11.x/java/kudu-client/src/main/java/org/apache/kudu/client/Operation.java#L182
but Batch does not,
https://github.com/apache/kudu/blob/branch-1.11.x/java/kudu-client/src/main/java/org/apache/kudu/client/Batch.java#L144