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Fix `Lucene104HnswScalarQuantizedVectorsFormat` merges with an asymmetric encoding (1 and 2 bit quantization today) and `COSINE` similarity: the merge scorer's query side was quantized from un-normalized vectors while the index side was normalized, so the merge trips an assertion and otherwise builds the graph from wrong scores.
</comment><date>2026-09-15 12:55:44 -0400</date><id>8ece74d1e2103f6fdb0788162e9b3a826b499dec</id><msg>Fix the COSINE merge scorer in Lucene104ScalarQuantizedVectorsReader (#16665)</msg><path><editType>add</editType><file>lucene/core/src/java/org/apache/lucene/codecs/lucene104/NormalizedFloatVectorValues.java</file></path><path><editType>edit</editType><file>lucene/core/src/test/org/apache/lucene/codecs/lucene104/TestLucene104ScalarQuantizedVectorsFormat.java</file></path><path><editType>edit</editType><file>lucene/core/src/java/org/apache/lucene/codecs/lucene104/Lucene104ScalarQuantizedVectorsReader.java</file></path><path><editType>edit</editType><file>lucene/core/src/java/org/apache/lucene/codecs/lucene104/Lucene104ScalarQuantizedVectorsWriter.java</file></path><path><editType>edit</editType><file>lucene/CHANGES.txt</file></path><path><editType>edit</editType><file>lucene/core/src/test/org/apache/lucene/codecs/lucene104/TestLucene104HnswScalarQuantizedVectorsFormat.java</file></path></item><kind>git</kind></changeSet><culprit><absoluteUrl>https://jenkins.thetaphi.de/user/noreply</absoluteUrl><fullName>noreply</fullName></culprit></freeStyleBuild>