opensearch-docs-cn/_im-plugin/ism/settings.md

layout	title	parent	nav_order
default	Settings	Index State Management	4

ISM settings

We don't recommend changing these settings; the defaults should work well for most use cases.

Index State Management (ISM) stores its configuration in the .opendistro-ism-config index. Don't modify this index without using the ISM API operations.

All settings are available using the OpenSearch _cluster/settings operation. None require a restart, and all can be marked persistent or transient. To learn more about static and dynamic settings, see Configuring OpenSearch.

Setting	Default	Description
plugins.index_state_management.enabled	True	Specifies whether ISM is enabled or not.
plugins.index_state_management.job_interval	5 minutes	The interval at which the managed index jobs are run.
plugins.index_state_management.jitter	0.6	A randomized delay that is added to a job's base run time to prevent a surge of activity from all indexes at the same time. A value of 0.6 means a delay of 0-60% of a job interval is added to the base interval. For example, if you have a base interval time of 30 minutes, a value of 0.6 means an amount anywhere between 0 to 18 minutes gets added to your job interval. Maximum is 1, which means an additional interval time of 100%. This maximum cannot exceed plugins.jobscheduler.jitter_limit, which also has a default of 0.6. For example, if plugins.index_state_management.jitter is set to 0.8, ISM uses plugins.jobscheduler.jitter_limit of 0.6 instead.
plugins.index_state_management.coordinator.sweep_period	10 minutes	How often the routine background sweep is run.
plugins.index_state_management.coordinator.backoff_millis	50 milliseconds	The backoff time between retries for failures in the ManagedIndexCoordinator (such as when we update managed indexes).
plugins.index_state_management.coordinator.backoff_count	2	The count of retries for failures in the ManagedIndexCoordinator.
plugins.index_state_management.history.enabled	True	Specifies whether audit history is enabled or not. The logs from ISM are automatically indexed to a logs document.
plugins.index_state_management.history.max_docs	2,500,000	The maximum number of documents before rolling over the audit history index.
plugins.index_state_management.history.max_age	24 hours	The maximum age before rolling over the audit history index.
plugins.index_state_management.history.rollover_check_period	8 hours	The time between rollover checks for the audit history index.
plugins.index_state_management.history.rollover_retention_period	30 days	How long audit history indexes are kept.
plugins.index_state_management.allow_list	All actions	List of actions that you can use.