
This uses the ES health API to get the cluster health status and pretty it up in our index/gate graph pages. The cluster health API is documented here: https://www.elastic.co/guide/en/elasticsearch/reference/current/cluster-health.html Also add a note to the readme on how to view the openstack ES cluster health. Change-Id: I3df833cf5024af7282e2602e7dfa5db9c3384b6a