R1:bbe206344302

[NO CLUE WHAT I'M DOING] Add an Elasticsearch engine

Summary:
I have no idea what I'm doing, but here's part of an elasticsearch engine. These things work:

- Indexing stuff (??)
- Searching for text/type?
- Reconstructing things??

All the complicated stuff doesn't work. I'm having a hard time figuring out the best way to model things because elasticsearch's documentation is not exactly the most complete or illuminating.

@amckinley, does this look sane-ish so far? Particularly, the…