Not able to create index pattern for audit logs in Kibana

Issue

Why is not possible to create an index-pattern for audit logs in Kibana?
Why is it not possible to create an index-pattern in Kibana for audit logs, even if the index exists in Elasticsearch?
Why is it not possible to create an index-pattern in Kibana for audit logs, even if the index exists and the user has rights to access them?

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