Move to elasticsearch version 1.0

Some breaking changes were made to (ao) the count api and the way fields are returned.

It is probably wise to upgrade the elasticsearch-py client as well.

See:
http://www.elasticsearch.org/blog/1-0-0-released/
http://www.elasticsearch.org/guide/en/elasticsearch/reference/1.x/breaking-changes.html
Merge branch 'feature_elastic1.0'

explain why this merge is necessary,