david-sitsky opened a new issue, #13626:
URL: https://github.com/apache/lucene/issues/13626
### Description
One of our internal users hit this error when merging their index after
loading all documents which contain some vector fields. I couldn't reproduce
this myself. Is there a corner case which has triggered this?
```
java.lang.NullPointerException: Cannot read field "vectorEncoding" because
"fieldEntry" is null
at
org.apache.lucene.codecs.lucene99.Lucene99FlatVectorsReader.getFloatVectorValues(Lucene99FlatVectorsReader.java:234)
~[lucene-core-9.11.1.jar:9.11.1 0c087dfdd10e0f6f3f6faecc6af4415e671a9e69 -
2024-06-23 12:31:02]
at
org.apache.lucene.codecs.lucene99.Lucene99HnswVectorsReader.getFloatVectorValues(Lucene99HnswVectorsReader.java:240)
~[lucene-core-9.11.1.jar:9.11.1 0c087dfdd10e0f6f3f6faecc6af4415e671a9e69 -
2024-06-23 12:31:02]
at
org.apache.lucene.codecs.KnnVectorsWriter$MergedVectorValues.mergeFloatVectorValues(KnnVectorsWriter.java:158)
~[lucene-core-9.11.1.jar:9.11.1 0c087dfdd10e0f6f3f6faecc6af4415e671a9e69 -
2024-06-23 12:31:02]
at
org.apache.lucene.codecs.lucene99.Lucene99FlatVectorsWriter.mergeOneFieldToIndex(Lucene99FlatVectorsWriter.java:312)
~[lucene-core-9.11.1.jar:9.11.1 0c087dfdd10e0f6f3f6faecc6af4415e671a9e69 -
2024-06-23 12:31:02]
at
org.apache.lucene.codecs.lucene99.Lucene99HnswVectorsWriter.mergeOneField(Lucene99HnswVectorsWriter.java:349)
~[lucene-core-9.11.1.jar:9.11.1 0c087dfdd10e0f6f3f6faecc6af4415e671a9e69 -
2024-06-23 12:31:02]
at
org.apache.lucene.codecs.KnnVectorsWriter.merge(KnnVectorsWriter.java:99)
~[lucene-core-9.11.1.jar:9.11.1 0c087dfdd10e0f6f3f6faecc6af4415e671a9e69 -
2024-06-23 12:31:02]
at
org.apache.lucene.index.SegmentMerger.mergeVectorValues(SegmentMerger.java:257)
~[lucene-core-9.11.1.jar:9.11.1 0c087dfdd10e0f6f3f6faecc6af4415e671a9e69 -
2024-06-23 12:31:02]
at
org.apache.lucene.index.SegmentMerger.mergeWithLogging(SegmentMerger.java:300)
~[lucene-core-9.11.1.jar:9.11.1 0c087dfdd10e0f6f3f6faecc6af4415e671a9e69 -
2024-06-23 12:31:02]
at org.apache.lucene.index.SegmentMerger.merge(SegmentMerger.java:151)
~[lucene-core-9.11.1.jar:9.11.1 0c087dfdd10e0f6f3f6faecc6af4415e671a9e69 -
2024-06-23 12:31:02]
at
org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:5293)
~[lucene-core-9.11.1.jar:9.11.1 0c087dfdd10e0f6f3f6faecc6af4415e671a9e69 -
2024-06-23 12:31:02]
at org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4761)
~[lucene-core-9.11.1.jar:9.11.1 0c087dfdd10e0f6f3f6faecc6af4415e671a9e69 -
2024-06-23 12:31:02]
at
org.apache.lucene.index.IndexWriter$IndexWriterMergeSource.merge(IndexWriter.java:6582)
~[lucene-core-9.11.1.jar:9.11.1 0c087dfdd10e0f6f3f6faecc6af4415e671a9e69 -
2024-06-23 12:31:02]
at
org.apache.lucene.index.SerialMergeScheduler.merge(SerialMergeScheduler.java:38)
~[lucene-core-9.11.1.jar:9.11.1 0c087dfdd10e0f6f3f6faecc6af4415e671a9e69 -
2024-06-23 12:31:02]
at
org.apache.lucene.index.IndexWriter.executeMerge(IndexWriter.java:2326)
~[lucene-core-9.11.1.jar:9.11.1 0c087dfdd10e0f6f3f6faecc6af4415e671a9e69 -
2024-06-23 12:31:02]
at
org.apache.lucene.index.IndexWriter.maybeMerge(IndexWriter.java:2321)
~[lucene-core-9.11.1.jar:9.11.1 0c087dfdd10e0f6f3f6faecc6af4415e671a9e69 -
2024-06-23 12:31:02]
at
org.apache.lucene.index.IndexWriter.forceMerge(IndexWriter.java:2162)
~[lucene-core-9.11.1.jar:9.11.1 0c087dfdd10e0f6f3f6faecc6af4415e671a9e69 -
2024-06-23 12:31:02]
```
### Version and environment details
This is with Lucene 9.11.1.
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