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. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@lucene.apache.org.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@lucene.apache.org For additional commands, e-mail: issues-h...@lucene.apache.org