I've not investigated this, but I can tell you right now that it's unlikely.
Sphinx expects unsigned integers as document ids, and pulls data directly from the database (or an XML source - though TS doesn't support the latter). While I think the first may be possible with Mongo (I've not used it, so not sure), the second almost certainly isn't.
That said, if you want to investigate further, that'd be fantastic - but my guess at this point is that it's just not feasible. Given my lack of MongoDB experience, though, I may be completely wrong.
Cheers
--
Pat
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