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Index lifecycle actions

Allocate: Move shards to nodes with different performance characteristics and reduce the number of replicas.
Delete: Permanently remove the index.
Force merge: Reduce the number of index segments and purge deleted documents.
Migrate: Move the index shards to the data tier that corresponds to the current ILM phase.
Read only: Block write operations to the index.
Rollover: Remove the index as the write index for the rollover alias and start indexing to a new index.
Downsample: Aggregates an index’s time series data and stores the results in a new read-only index. For example, you can downsample hourly data into daily or weekly summaries.
Searchable snapshot: Take a snapshot of the managed index in the configured repository and mount it as a searchable snapshot.
Set priority: Lower the priority of an index as it moves through the lifecycle to ensure that hot indices are recovered first.
Shrink: Reduce the number of primary shards by shrinking the index into a new index.
Unfollow: Convert a follower index to a regular index. Performed automatically before a rollover, shrink, or searchable snapshot action.
Wait for snapshot: Ensure that a snapshot exists before deleting the index.