I had hit some blokers and had to de-schedule it from 4.3's targets. I'm marking it for re-evaluation for 4.4.

Running it in update mode is not hard, the hard part is to figure which Documents in the index need to be deleted. Assuming we build this incrementally, would it be of any use to you if the initial version where not to deal with deletions? (deletions don't affect the actual results but could slow down the queries by bloating the index)

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