I had drafted some ideas about a similar design while in St Louis with
Emmanuel and Hardy about a truly partitioned index, with index
segments and values located in the same containers; if someone is
serious about it I could share the design but I'd estimate some ~6
months full time work on it, including an ad-hoc B-tree in memory to
replace traditional Lucene indexes. And we had some Whiskey, so maybe
it won't work.