What is Des.cluster.name in elastic search image command?

The command for running elastic search image is :
$ docker run --name some-elasticsearch -d elasticsearch:2 elasticsearch -Des.cluster.name="graylog"
What is the meaning of elasticsearch -Des.cluste.name="graylog" in this command, is it compulsory to add every time I need to create the container ?

Hej @AkashKrDutta

please read the elasticsearch docker documentation - and to answer short: yes because that is part of the elasticsearch configuration

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