romseygeek opened a new issue, #15217:
URL: https://github.com/apache/lucene/issues/15217
### Description
Elasticsearch CI found this one:
```
2> WARNING: Vector bitsize and/or integer vectors enforcement; using
default vectorization provider outside of testMode
2> Seb 23, 2025 12:47:14 GH
com.carrotsearch.randomizedtesting.RandomizedRunner$QueueUncaughtExceptionsHandler
uncaughtException
2> WARNING: Uncaught exception in thread: Thread[#37,Lucene Merge Thread
#1,5,TGRP-TestLucene104ScalarQuantizedVectorsFormat]
2> org.apache.lucene.index.MergePolicy$MergeException:
java.lang.AssertionError
2> at __randomizedtesting.SeedInfo.seed([C471F93B90921D0F]:0)
2> at
org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:764)
2> at
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:756)
2> Caused by: java.lang.AssertionError
2> at org.apache.lucene.util.VectorUtil.dotProduct(VectorUtil.java:68)
2> at
org.apache.lucene.codecs.lucene104.Lucene104ScalarQuantizedVectorsWriter$QuantizedFloatVectorValues.<init>(Lucene104ScalarQuantizedVectorsWriter.java:703)
2> at
org.apache.lucene.codecs.lucene104.Lucene104ScalarQuantizedVectorsWriter.mergeOneField(Lucene104ScalarQuantizedVectorsWriter.java:353)
2> at
org.apache.lucene.codecs.perfield.PerFieldKnnVectorsFormat$FieldsWriter.mergeOneField(PerFieldKnnVectorsFormat.java:126)
2> at
org.apache.lucene.codecs.KnnVectorsWriter.merge(KnnVectorsWriter.java:105)
2> at
org.apache.lucene.index.SegmentMerger.mergeVectorValues(SegmentMerger.java:271)
2> at
org.apache.lucene.index.SegmentMerger.mergeWithLogging(SegmentMerger.java:314)
2> at
org.apache.lucene.index.SegmentMerger.merge(SegmentMerger.java:158)
2> at
org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:5317)
2> at org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4778)
2> at
org.apache.lucene.index.IndexWriter$IndexWriterMergeSource.merge(IndexWriter.java:6601)
2> at
org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:668)
2> at
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:729)
```
It reproduces on my Macbook. cc @mccullocht @benwtrent
### Gradle command to reproduce
./gradlew :lucene:core:test --tests
"org.apache.lucene.codecs.lucene104.TestLucene104ScalarQuantizedVectorsFormat.testEmptyFloatVectorData"
-Ptests.jvms=12 -Ptests.jvmargs= -Ptests.seed=C471F93B90921D0F
-Ptests.useSecurityManager=true -Ptests.nightly=true -Ptests.gui=true
-Ptests.file.encoding=US-ASCII -Ptests.vectorsize=128
-Ptests.forceintegervectors=true
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