Sorry you are having issues with running Enterprise Search. Is your Elasticsearch cluster an officially licensed one? At least a free Basic license is required on Elasticsearch for it to be compatible with the Enterprise Search solution.
My elastic search instance is a licensed one hosted in my aws account.
The above docker file worked when i was running my elastic search instance as well through docker. When i shifted it to an actual instance running in aws cluster , it starting giving the above error.
Not sure if this is an error in the actual config you are using or just a typo in forum post, but it seems that you shouldn't have a " before ELASTIC_HOSTNAME.
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