msokolov commented on code in PR #1054:
URL: https://github.com/apache/lucene/pull/1054#discussion_r940165941


##########
lucene/core/src/test/org/apache/lucene/util/hnsw/KnnGraphTester.java:
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@@ -248,7 +269,9 @@ private void run(String... args) throws Exception {
           if (docVectorsPath == null) {
             throw new IllegalArgumentException("missing -docs arg");
           }
-          matchDocs = generateRandomBitSet(numDocs, selectivity);
+          if (prefilter) {

Review Comment:
   FYI: I did a couple of runs with `filterSelectivity==0.1` and `prefilter` 
and no `prefilter`, and it seems to work OK - no errors and the prefilter case 
returned higher recall / lower latency for the same other settings



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