Test failure in TestKnnGraph.testMultiThreadedSearch about lucene HOT 6 CLOSED

Thanks @vsop-479, it reproduces for me as well, both on main and 9x branches. The same test passes on 9.8.0 release. I'll try git bisect ... and it blames this commit:

[a47ba33] Refactoring HNSW to use a new internal FlatVectorFormat (#12729)

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#12943

@msokolov LOL

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We both figured it out at the same time.

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I can see that in this test run we are using a quantizing scorer, but I don't think the test case explicitly calls for that. I wonder if we beefed up the test framework to randomly use quantization and it is introducing "rounding" errors or something here?

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ah, thanks @benwtrent I'll check your fix then

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I can see that in this test run we are using a quantizing scorer, but I don't think the test case explicitly calls for that. I wonder if we beefed up the test framework to randomly use quantization and it is introducing "rounding" errors or something here?

Your instincts are correct :)

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