[META] Remote Store Migration Support

[gbbafna]

Please describe the end goal of this project

To support migration of existing Doc Rep cluster to/from Remote backed cluster which has Remote backed Segment , and Translog enabled.

Supporting References

https://github.com/opensearch-project/OpenSearch/issues/12246

Issues

• [x] Mixed Mode Support https://github.com/opensearch-project/OpenSearch/issues/12245
• [x] Primary Shard Relocation to Remote node https://github.com/opensearch-project/OpenSearch/issues/12689
• [x] Local Recovery - Seeding https://github.com/opensearch-project/OpenSearch/pull/12922
• [x] Add allocation decider for mixed cluster https://github.com/opensearch-project/OpenSearch/issues/12518
• [x] Dual Replication - Primary changes
• [x] Set index settings for new indices/snapshot restores appropriately in mixed mode https://github.com/opensearch-project/OpenSearch/issues/12852
• [x] Shard Allocation side changes to prefer primary promotion based on direction https://github.com/opensearch-project/OpenSearch/pull/13136
• [x] Complete migration of an index to remote store backed by updating index settings https://github.com/opensearch-project/OpenSearch/pull/13316
• [x] Reject Resize index requests while remote store migration is undergoing - https://github.com/opensearch-project/OpenSearch/pull/12686
• [x] Replica Shard Relocation to Remote node
• [x] Failover handling - DocRep Shard Promotion
• [x] Failover handling - Remote Shard Promotion
• [x] https://github.com/opensearch-project/cross-cluster-replication/issues/1360
• [x] https://github.com/opensearch-project/OpenSearch/issues/12961
• [x] https://github.com/opensearch-project/OpenSearch/issues/13101
• [x] https://github.com/opensearch-project/OpenSearch/issues/13102
• [ ] https://github.com/opensearch-project/OpenSearch/issues/8610
• [x] https://github.com/opensearch-project/OpenSearch/pull/13159
• [x] https://github.com/opensearch-project/OpenSearch/issues/13302
• [x] https://github.com/opensearch-project/OpenSearch/pull/13322
• [ ] Remove experimental flag for remote store direction .

Related component

Storage:Remote