Change es version to 1.0.0.RC1
Replace DeleteResponse.isNotFound() to DeleteResponse.isFound() (is related to the commit https://github.com/elasticsearch/elasticsearch/commit/2cb40fcb1741ce1bf4c770aeec8b85717f2b5d98)
Merge pull request #2 from johtani/change-to-elasticsearch-1.0.0.RC1

Change es version to 1.0.0.RC1