benwtrent commented on issue #14429:
URL: https://github.com/apache/lucene/issues/14429#issuecomment-2981454239
Working more on this, we have ran multiple diagnostics on the machines, no
hardware issues seem to arise.
This issue arises not only on merge, but I have seen it on flush.
```
Caused by:
org.elasticsearch.common.io.stream.NotSerializableExceptionWrapper:
unsupported_operation_exception: null
at org.apache.lucene.util.fst.Outputs.merge(Outputs.java:95)
~[lucene-core-9.11.1.jar:?]
at org.apache.lucene.util.fst.FSTCompiler.add(FSTCompiler.java:936)
~[lucene-core-9.11.1.jar:?]
at
org.apache.lucene.codecs.lucene90.blocktree.Lucene90BlockTreeTermsWriter$PendingBlock.append(Lucene90BlockTreeTermsWriter.java:593)
~[lucene-core-9.11.1.jar:?]
at
org.apache.lucene.codecs.lucene90.blocktree.Lucene90BlockTreeTermsWriter$PendingBlock.compileIndex(Lucene90BlockTreeTermsWriter.java:562)
~[lucene-core-9.11.1.jar:?]
at
org.apache.lucene.codecs.lucene90.blocktree.Lucene90BlockTreeTermsWriter$TermsWriter.writeBlocks(Lucene90BlockTreeTermsWriter.java:776)
~[lucene-core-9.11.1.jar:?]
at
org.apache.lucene.codecs.lucene90.blocktree.Lucene90BlockTreeTermsWriter$TermsWriter.finish(Lucene90BlockTreeTermsWriter.java:1163)
~[lucene-core-9.11.1.jar:?]
at
org.apache.lucene.codecs.lucene90.blocktree.Lucene90BlockTreeTermsWriter.write(Lucene90BlockTreeTermsWriter.java:402)
~[lucene-core-9.11.1.jar:?]
at
org.apache.lucene.codecs.perfield.PerFieldPostingsFormat$FieldsWriter.write(PerFieldPostingsFormat.java:172)
~[lucene-core-9.11.1.jar:?]
at
org.apache.lucene.index.FreqProxTermsWriter.flush(FreqProxTermsWriter.java:134)
~[lucene-core-9.11.1.jar:?]
at org.apache.lucene.index.IndexingChain.flush(IndexingChain.java:333)
~[lucene-core-9.11.1.jar:?]
at
org.apache.lucene.index.DocumentsWriterPerThread.flush(DocumentsWriterPerThread.java:445)
~[lucene-core-9.11.1.jar:?]
at
org.apache.lucene.index.DocumentsWriter.doFlush(DocumentsWriter.java:496)
~[lucene-core-9.11.1.jar:?]
at
org.apache.lucene.index.DocumentsWriter.maybeFlush(DocumentsWriter.java:450)
~[lucene-core-9.11.1.jar:?]
at
org.apache.lucene.index.DocumentsWriter.preUpdate(DocumentsWriter.java:391)
~[lucene-core-9.11.1.jar:?]
at
org.apache.lucene.index.DocumentsWriter.updateDocuments(DocumentsWriter.java:413)
~[lucene-core-9.11.1.jar:?]
at
org.apache.lucene.index.IndexWriter.updateDocuments(IndexWriter.java:1561)
~[lucene-core-9.11.1.jar:?]
at
org.apache.lucene.index.IndexWriter.addDocuments(IndexWriter.java:1519)
~[lucene-core-9.11.1.jar:?]
```
What's even weirder, I have seen it happen during document replication,
meaning the primary index seems to have accepted the doc without issue :( and
it only failed on replica.
I am still trying to get information about the field contents, but this is
proving difficult.
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