[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

#12246

Issues

• Mixed Mode Support [Remote Store] Mixed mode support for remote store migration #12245
• Primary Shard Relocation to Remote node [Remote Store Migration] Relocation of primary shards from doc rep to remote store node #12689
• Local Recovery - Seeding Integrate local recovery with remote store seeding during migration #12922
• Add allocation decider for mixed cluster [Remote Store] Add allocation decider for mixed cluster #12518
• Dual Replication - Primary changes
• Set index settings for new indices/snapshot restores appropriately in mixed mode [Remote Store] Update remote store index settings for mixed cluster #12852
• Shard Allocation side changes to prefer primary promotion based on direction Prefer remote replicas for primary promotion during migration #13136
• Complete migration of an index to remote store backed by updating index settings [Remote Store] Update index settings on shard movement during remote store migration #13316
• Reject Resize index requests while remote store migration is undergoing - Reject Resize index requests. (i.e, split, shrink and… #12686
• Replica Shard Relocation to Remote node
• Failover handling - DocRep Shard Promotion
• Failover handling - Remote Shard Promotion
• [Remote Migration] Support CCR while migrating to/from remote store  cross-cluster-replication#1360
• [Remote Migration] Allow replica allocation on excluded nodes during mixed mode  #12961
• [Remote Store] Take shallow copy snapshot only when remote store compatibility mode is STRICT #13101
• [Remote Store] Override index settings during restore snapshot based on direction when remote store compatibility mode is MIXED #13102
• [Snapshot Interop] Add Shallow Copy Snapshots list in Snapshot Repository Data #8610
• [Remote Store - Dual Replication] Create missing Retention Leases for docrep shard copies during failover #13159
• [Feature Request] Upload remote index path for migrating indexes from docrep to remote #13302
• Handle shard allocation for NONE migration direction #13322
• Remove experimental flag for remote store direction .

Related component

Storage:Remote