How to stop auto index creation

I'm using Elasticsearch(7.16.0) with Metricbeat and Filebeat.

It will create unused indexes automtically. e.g. dekitateserver-filebeat-7.11.1-*.
Curentlly, Filebeat is using only dekitateserver-filebeat-2021-*.
How to stop auto index creation for old indexes?

Welcome to our community! :smiley:

If you delete those indices, do they reappear?

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