You can use the following cluster settings to enable or disable index management features.
(Dynamic) Enables opening of closed indices in Elasticsearch. You might enable this setting temporarily to change the analyzer configuration for an existing index. We strongly recommend leaving this set to
false(the default) otherwise.
Closed indices are a data loss risk because they are not included when you make cluster configuration changes, such as scaling to a different capacity, failover, and many other operations. Additionally, closed indices can lead to inaccurate disk space counts.