Downloaded and deployed Kafka adaptor as per instructions.    Did not appear in connector list.  Stopped service, cleared cache, restarted service - still did not work.
The COT adaptors do deploy with the same instructions...   Looking for  vplechnoy to confirm if this is broken, or if there is secret sauce I am missing -
COT connector:  http://www.arcgis.com/home/item.html?id=067feaad95964bc5889d6f44f774b370