I saw that Kibana 4.2 is out and was excited to check it out. While browsing the Release Notes and Setup Guide, I notice that it claim 4.2 will work with Elasticsearch 1.4.4 or newer. AFAIK, Kibana 4.2 requires ES 2.0 or newer.
Indeed - We'll get that fixed Thanks for reporting!
Kibana 4.2 works with ES 2.0 and newer.