"Discovery configuration is required in production mode critical" in Upgrade Assiant


I want upgrade Elastic Stack fron 6.6 to 7.0.
In Upgrade Assistand i get critical error:

Discovery configuration is required in production mode
nodes which do not have discovery configured: [eBB7xaH]
I have one server for Elastic Stack.

How to fix? Anyone encountered?
Thank you

You can find out more about this deprecation here: https://www.elastic.co/guide/en/elasticsearch/reference/current/breaking-changes-7.0.html#_discovery_configuration_is_required_in_production

There should be a link to this from the Upgrade Assistant.

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