Problem with setting up ES 7.6.2 instance on Docker

Dear Experts and Community,
I have the following problem. I pull a ES image from Docker Hub, then I configure it to bind ports to host: 9200,9300. I add the following env var:
cluster.initial_master_nodes = elasticsearch
And then I deploy the container. It runs okay, however I know it probably runs in normal mode, so it is ready to be clustered any time.
And I want it to run in single node mode, however if I add a single_node variable to Env it logs that there is no such option...
Thanks to anybody who will be willing to help or even give me a clue on that matter.

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