MW tries to talk to port 9243, but only deployment-elastic06 allows connections to that:
krenair@deployment-deploy01:~$ curl -k https://deployment-elastic05:9243 curl: (7) Failed to connect to deployment-elastic05 port 9243: Connection refused krenair@deployment-deploy01:~$ curl -k https://deployment-elastic06:9243 { "name" : "deployment-elastic06-beta-search", "cluster_name" : "beta-search", "cluster_uuid" : "efwSGT3zQxG3tmChOUksEQ", "version" : { "number" : "5.5.2", "build_hash" : "b2f0c09", "build_date" : "2017-08-14T12:33:14.154Z", "build_snapshot" : false, "lucene_version" : "6.6.0" }, "tagline" : "You Know, for Search" } krenair@deployment-deploy01:~$ curl -k https://deployment-elastic07:9243 curl: (7) Failed to connect to deployment-elastic07 port 9243: Connection refused