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Support failover scenario of a replica re-assigned as a primary.
Right now this flow fails because of how we wire up the engine as readOnly by setting IndexWriter to null.
Issues remaining (updated 7/22):
- [Segment Replication] Update shard promotion algorithm to consider replica checkpoints. #3988
- [Segment Replication] Swap replica to writeable engine during failover. #3989
- [Segment Replication] Swap primary engine to NRTReplicationEngine during handoff. #4007
- [Segment Replication] Synchronize checkpoint updates with failover. #4136
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