It's spreading pretty rapidly in my circles. It's used by a lot of popular sites, such as Github, Soundcloud, Stumbleupon, Quora, Foursquare, Etsy, etc. They

It's spreading pretty rapidly in my circles. It's used by a lot of popular sites, such as Github, Soundcloud, Stumbleupon, Quora, Foursquare, Etsy, etc. They have some case studies: http://www.elasticsearch.org/case-study/ http://www.elasticsearch.org/case-study/ eg. http://www.elasticsearch.org/case-study/github/ http://www.elasticsearch.org/case-study/github/ http://www.elasticsearch.org/case-study/soundcloud/ http://www.elasticsearch.org/case-study/soundcloud/ http://www.elasticsearch.org/case-study/stumbleupon/ http://www.elasticsearch.org/case-study/stumbleupon/