1.4

I have adapted this plugin to work with ES 1.2.1 using the lucene version 4.8.1. 
Instead of adding RestXContentBuilder and XContentRestResponse which were removed from the ES API, I re-wrote the RestUpdateByQueryAction to use the new API entirely without copying over removed classes.

My comment on issue #15 was the beginning of my notes on the changes I had made. https://github.com/yakaz/elasticsearch-action-updatebyquery/issues/15