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Index lifecycle management settings in Elasticsearch

These are the settings available for configuring index lifecycle management (ILM).

Cluster level settings

xpack.ilm.enabled: (Static, Boolean) [7.8.0] Deprecated in 7.8.0. Basic License features are always enabled
This deprecated setting has no effect and will be removed in Elasticsearch 8.0.
indices.lifecycle.history_index_enabled: (Static, Boolean) Whether ILM’s history index is enabled. If enabled, ILM will record the history of actions taken as part of ILM policies to the ilm-history-* indices. Defaults to true.
indices.lifecycle.poll_interval: (Dynamic, time unit value) How often index lifecycle management checks for indices that meet policy criteria. Defaults to 10m.

Index level settings

These index-level ILM settings are typically configured through index templates. For more information, see Create a lifecycle policy.

index.lifecycle.indexing_complete: (Dynamic, Boolean) Indicates whether or not the index has been rolled over. Automatically set to true when ILM completes the rollover action. You can explicitly set it to skip rollover. Defaults to false.
index.lifecycle.name: (Dynamic, string) The name of the policy to use to manage the index. For information about how Elasticsearch applies policy changes, see Policy updates.

index.lifecycle.origination_date: (Dynamic, long) If specified, this is the timestamp used to calculate the index age for its phase transitions. Use this setting if you create a new index that contains old data and want to use the original creation date to calculate the index age. Specified as a Unix epoch value in milliseconds.

index.lifecycle.parse_origination_date: (Dynamic, Boolean) Set to true to parse the origination date from the index name. This origination date is used to calculate the index age for its phase transitions. The index name must match the pattern ^.*-{date_format}-\\d+, where the date_format is yyyy.MM.dd and the trailing digits are optional. An index that was rolled over would normally match the full format, for example logs-2016.10.31-000002). If the index name doesn’t match the pattern, index creation fails.

index.lifecycle.step.wait_time_threshold: (Dynamic, time value) Time to wait for the cluster to resolve allocation issues during an ILM shrink action. Must be greater than 1h (1 hour). Defaults to 12h (12 hours). See Shard allocation for shrink.
index.lifecycle.rollover_alias: (Dynamic, string) The index alias to update when the index rolls over. Specify when using a policy that contains a rollover action. When the index rolls over, the alias is updated to reflect that the index is no longer the write index. For more information about rolling indices, see Rollover.

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https://www.elastic.co/guide/en/elasticsearch/reference/7.17/ilm-settings.html