Default ELASTIC_SEARCH_HOSTS to the host/docker name we use in production

Also removed some comments that didn't add any new information.

pillar/config.py

@@ -80,9 +80,8 @@ ALGOLIA_INDEX_NODES = 'dev_Nodes'
 
 SEARCH_BACKENDS = ('algolia', 'elastic')    # search backend we use
 
-ELASTIC_SEARCH_HOSTS = ['elasticsearch']    # elasticsearch hosts
+ELASTIC_SEARCH_HOSTS = ['elastic']
 ELASTIC_INDICES = {
-    # elasticsearch indexes
     'NODE': 'nodes',
     'USER': 'users',
 }