elasticsearch 1.0.0.RC1

I've updated from 0.90.7 to 1.0.0.RC1 with this formula, but it has been install in `/usr/local/Cellar/elasticsearch/1` instead of `/usr/local/Cellar/elasticsearch/1.0.0.RC1`.

I don't know if it's an issue, but I don't know Homebrew enough to fix this.