The relative path of the URL is incorrect. Is there a proxy in-between?
The protocol (http/https) does not match the port.
Is this really an Elasticsearch server?
ERROR: Uknown error
I don't understand. Once i install x-pack it will require authentication to access, yet that setup-plugins appears to try and hit ES without it... so it fails. How in the heck is that ever supposed to work?
For other folks who come by this, I had the same issue - doing a curl against the URL it complains about provides more information - you need to have an elastic stack license which supports security.
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