Visualizing Logstash Output

Sorry if this has been discussed before, I am a newbie in ELK stack

I have two application servers which has a bunch of log files that i collect and parse using logstash. Now i need Kibana to visualize those logs but the logstash output might become very large after some time. How can i automatically delete my previous log output from elasticsearch and kibana ?

Please guide me on this part.

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