docker-healthcheck with elasticsearch

[eloo]

Describe the Bug

Hi,
i'm curious how the docker-healtchcheck should work for elasticsearch or in general.
For elasticsearch the port is fixed to 9200 also the host is localhost or hostname. Shouldn't this be something from ES_HOSTS?

Also for the general docker-healtcheck i just get an 503 Service unavailable. And i don't have a clue whats wrong.
No logs. No response.
the index.html is reachable.

So i really don't get it how the docker-healthcheck should work.

Tested version: 2.22.2 and 2.22.0
Last working version: 2.21.7

Steps to Reproduce

Start a zipkin instance with configured ES_HOSTS

Expected Behaviour

I would expect that the healthcheck would pass or at least give hints whats wrong.

Best regards
eloo