Hello!
I have developed an upstream module for Sphinx2 search platform. It's available at: https://github.com/reeteshranjan/sphinx2-nginx-module
It talks to Sphinx2 searchd component for performing search. It's in infant stage right now and more work is needed to get to production ready. I am working on it. In case any one is interested in working with me on this module, please let me know.
If you are looking to play with it, it is built and installed like any other third party module using the source available at link provided above.
Thanks,Reetesh

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