Configuring the elasticsearch url in Docker

[marcofranssen]

Since Elasticsearch 6.6.0 the setting elasticsearch.url is replaced by elasticsearch.hosts.

https://www.elastic.co/guide/en/kibana/6.8/settings.html

The README still shows ELASTICSEARCH_URL has to be configured.

I think Kibiter should follow the settings like in original Kibana.

Seems ELASTICSEARCH_HOSTS is currently not handled.

This means you also can't loadbalance on multiple elasticsearch nodes.
Furthermore I tried using a Traefik setup to loadbalance, but this still mandates me to run on port 9200. Preferably I would like to run my Loadbalancer on port 80 and 443 only.