[Segment Replication] Update PrimaryShardAllocator to prefer replicas with higher replication checkpoint#4041

Merged

dreamer-89 merged 11 commits intoopensearch-project:mainfrom dreamer-89:segrep_failover_primary_selection

Aug 18, 2022

+314-14

Commits on Aug 9, 2022

[Segment Replication] Update PrimaryShardAllocator to prefer replicas having higher replication checkpoint
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Use empty replication checkpoint to avoid NPE
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Update NodeGatewayStartedShards to optionally wire in/out ReplicationCheckpoint field
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Use default replication checkpoint causing EOF errors on empty checkpoint
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Add indexSettings to GatewayAllocator to allow ReplicationCheckpoint comparator only for segrep enabled indices
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Add unit tests for primary term first replica promotion & comparator fix
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Fix NPE on empty IndexMetadata
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Remove settings from AllocationService and directly inject in GatewayAllocator
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Add more unit tests and minor code clean up
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Address review comments & integration test
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Fix comparator on null ReplicationCheckpoint
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