Unable to setup coordinating only node using command line parameters

I know i can use elasticsearch.yml but I wanted to use the following command to start a coordinating only node but failed.
Is it a bug?

./bin/elasticsearch -E"node.roles="

Any help is appreciated

I also cannot think of a way to specify an empty list on the command line like that. Please open an issue on Github. Not sure it counts as a bug but seems like a reasonable feature request.

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