Hello! I have a ~20GB index and try to make a concurrent search over it. The index has 16 segments, I run SpanQuery.getSpans() on each segment concurrently. I see really small performance improvement of searching concurrently. I suppose, the reason is that the sizes of the segments are very non-uniform (3 segments have ~20 000 docs each, and the others have less than 1 000 each). How to make more uniformly sized segments (I now use just writer.forceMerge(16)), and are multiple index segments the most important thing in Lucene concurrency?
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