CheckCollectionsQueryable check all channels are watched and all segments are loaded for this collection.

In a replica, a shard is available, if and only if: 1.

GroupNodesByReplica groups nodes by replica, returns ReplicaID -> NodeIDs.

GroupPartitionsByCollection groups partitions by collection, returns CollectionID -> Partitions.

GroupSegmentsByReplica groups segments by replica, returns ReplicaID -> Segments.

packSegmentLoadInfo packs SegmentLoadInfo for given segment, packs with index if withIndex is true, this fetch indexes from IndexCoord.

RecoverAllCollectionrecovers all replica of all collection in resource group.

RecoverReplicaOfCollection recovers all replica of collection with latest resource group.

SpawnReplicasWithRG spawns replicas in rgs one by one for given collection.