1st I just updated to Graylog 3.3, and so far I am really enjoying the new interface. I am attempting to use a Cerebro container to gain insight to the Elasticsearch container. My ES container does not have ANY exposed ports, however graylog is still getting the data into ES. I have installed the Cerebro container, and I am not able to connect to http://localhost:9200. I exposed port 9200 in my ES container, and still not able to connect. Thoughts to what I need to change?