add cluster health to list of unauthenticated endpoints
add cluster health to list of unauthenticated endpoints

wolfeidau/elk-stack,Fuseit/elk-stack,woakes070048/elk-stack,toadkicker/elk-stack,Fuseit/elk-stack,wolfeidau/elk-stack,freakynit/elk-stack,toadkicker/elk-stack,toadkicker/elk-stack,guardian/elk-stack,freakynit/elk-stack,woakes070048/elk-stack,toadkicker/elk-stack,guardian/elk-stack