Use elasticsearch 1.0.0

Changelog

- Use elasticsearch 1.0.0 and lucene 4.6.1; to be determined whether the lucene version bump breaks anything.
- Change `SearchRequestBuilder.setFilter` to `SearchRequestBuilder.setPostFilter` [see this](http://www.elasticsearch.org/guide/en/elasticsearch/reference/1.x/_search_requests.html).

Are there any other changes that must be made?

`mvn test` passes on my machine.