I was doing some experiments today, and managed to briefly knock over a server in the process. I looked at searching multiple indexes (Lucene's MultiSearcher) and merging (IndexWriter.addIndexesNoOptimize). The former is unusably slow. The latter seems to be on track for about 6 hours if the destination is HDD. About 4 if destination is SDD. When it finishes, we'll see what query speed looks like.
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