[Feature Request] Enable Automatic index creation only to predefined templates #19617
Description
Is your feature request related to a problem? Please describe
It would be useful to be able to enable the auto_create_index action but only for those that have a defined template, kind of like the dynamic: "strict_allow_templates" from mappings as this really helps preventing human error.
Describe the solution you'd like
The documentation of the action.auto_create_index option defines this option as a boolean. So it can only be either enabled or disabled. A third option allow_template could be added that enables the creation of indexes that match any template.
Related component
Cluster Manager
Describe alternatives you've considered
In ElasticSearch it is possible to provide a comma-separated list of index name patterns to this config, which is not ideal, as it would be necessary to update the configuration whenever a new template is created, but at least allows the behavior.
Additional context
No response