Automattic's Fork

Howdy,

First of all sorry about this huge pull request, mainly I wanted to get a conversation going to see if you guys would be interested in merging some of the stuff from Automattic's fork of your plugin back in. We've made some extensive changes but mainly this fork:
* Renames some stats to conform with ES native JSON API's naming schemes more
* Is updated to work with multi node clusters without over-reporting index stats
* Reports node stats for all nodes
* Is ES 1.x compatible

Let me know if you guys are interested in merging in any of these features from our fork.