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This module provides per-index settings to control the allocation of shards to nodes:
- Shard allocation filtering: Controlling which shards are allocated to which nodes.
- Delayed allocation: Delaying allocation of unassigned shards caused by a node leaving.
- Total shards per node: A hard limit on the number of shards from the same index per node.
- Data tier allocation: Controls the allocation of indices to data tiers.