Hi,
We have built the Mule iON iPaaS on top of Elasticsearch/MongoDB and are very happy with how things have worked out. Thanks Shay!
If you are in the area, drop by for a technical discussion of everything we have learned along the way, and where we are headed.
http://www.amazonsanfrancisco.com/events/27038071/?a=socialmedia&eventId=27038071&action=detail
Cheers,
-Erik