Syntax to specify multiple hosts using ELASTICSEARCH_HOSTS env?

[Supermathie (Michael Brown)]

@Aaron_Caldwell in the other topic you suggested:

@Aaron_Caldwell

ELASTICSEARCH_HOSTS:
  - <host1>
  - <host2>
  - <host3>

That syntax looks fine for kibana.yml but how do we express that as an environment variable? Adding an example to the actual documentation would be REALLY helpful.