Old problem not solved. Every version of kibana creates new index template .kibana-event-log-7.xx.y-template with kibana-event-log-policy ILM policy that delete index after 90 days, but also keep creating new index every 30 days.
Result is each kibana version I ever installed has 3 useless indexes - and my elastic has more than hundred of them now.
It is [event log] ILM policy still active for older indices no longer active · Issue #97755 · elastic/kibana · GitHub that promised automatic solution [Rollover] Autodelete Empty Indices · Issue #73349 · elastic/elasticsearch · GitHub but some way that removes unsupported kibana versions still missing.