Question in using elasticsearch-certutil to generate cert

I have generated elastic-stack-ca.p12

Then I use this command to generate crt and key files for logstash.

./bin/elasticsearch-certutil cert --ca elastic-stack-ca.p12 --name logstash --dns [?] --ip [elk server's ip] --pem --out
I don't set any dns for my elk server, what does the param --dns should be? I was told this param is mandatory.

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