Build: https://jenkins.thetaphi.de/job/Lucene-nightly-main-Linux/1661/
Java: 64bit/hotspot/jdk-27-ea+23 -XX:+UseCompressedOops -XX:+UseZGC

1 tests failed.
FAILED:  
org.apache.lucene.index.TestAddIndexes.testAddIndexesWithConcurrentMerges

Error Message:
com.carrotsearch.randomizedtesting.UncaughtExceptionError: Captured an uncaught 
exception in thread: Thread[id=400, name=Lucene Merge Thread #120, 
state=RUNNABLE, group=TGRP-TestAddIndexes]

Stack Trace:
com.carrotsearch.randomizedtesting.UncaughtExceptionError: Captured an uncaught 
exception in thread: Thread[id=400, name=Lucene Merge Thread #120, 
state=RUNNABLE, group=TGRP-TestAddIndexes]
        at 
__randomizedtesting.SeedInfo.seed([A68F763A2277DCB2:8628A935F605C10E]:0)
Caused by: org.apache.lucene.index.MergePolicy$MergeException: 
java.nio.file.FileSystemException: 
/home/jenkins/workspace/Lucene-nightly-main-Linux/lucene/core/build/tests-tmp/lucene.index.TestAddIndexes_001/index-NIOFSDirectory-001/_20_Lucene104_0.tip:
 Too many open files
        at __randomizedtesting.SeedInfo.seed([A68F763A2277DCB2]:0)
        at 
org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:761)
        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:753)
Caused by: java.nio.file.FileSystemException: 
/home/jenkins/workspace/Lucene-nightly-main-Linux/lucene/core/build/tests-tmp/lucene.index.TestAddIndexes_001/index-NIOFSDirectory-001/_20_Lucene104_0.tip:
 Too many open files
        at 
org.apache.lucene.tests.mockfile.HandleLimitFS.onOpen(HandleLimitFS.java:67)
        at 
org.apache.lucene.tests.mockfile.HandleTrackingFS.callOpenHook(HandleTrackingFS.java:82)
        at 
org.apache.lucene.tests.mockfile.HandleTrackingFS.newFileChannel(HandleTrackingFS.java:202)
        at 
org.apache.lucene.tests.mockfile.FilterFileSystemProvider.newFileChannel(FilterFileSystemProvider.java:206)
        at java.base/java.nio.channels.FileChannel.open(FileChannel.java:301)
        at java.base/java.nio.channels.FileChannel.open(FileChannel.java:353)
        at 
org.apache.lucene.store.NIOFSDirectory.openInput(NIOFSDirectory.java:78)
        at 
org.apache.lucene.tests.util.LuceneTestCaseParent.slowFileExists(LuceneTestCaseParent.java:1405)
        at 
org.apache.lucene.tests.store.MockDirectoryWrapper.openInput(MockDirectoryWrapper.java:799)
        at 
org.apache.lucene.codecs.lucene103.blocktree.Lucene103BlockTreeTermsReader.<init>(Lucene103BlockTreeTermsReader.java:127)
        at 
org.apache.lucene.codecs.lucene104.Lucene104PostingsFormat.fieldsProducer(Lucene104PostingsFormat.java:425)
        at 
org.apache.lucene.codecs.perfield.PerFieldPostingsFormat$FieldsReader.<init>(PerFieldPostingsFormat.java:315)
        at 
org.apache.lucene.codecs.perfield.PerFieldPostingsFormat.fieldsProducer(PerFieldPostingsFormat.java:375)
        at 
org.apache.lucene.index.SegmentCoreReaders.<init>(SegmentCoreReaders.java:98)
        at org.apache.lucene.index.SegmentReader.<init>(SegmentReader.java:95)
        at 
org.apache.lucene.index.ReadersAndUpdates.getReader(ReadersAndUpdates.java:180)
        at 
org.apache.lucene.index.ReadersAndUpdates.getReaderForMerge(ReadersAndUpdates.java:847)
        at 
org.apache.lucene.index.IndexWriter.lambda$mergeMiddle$0(IndexWriter.java:5195)
        at 
org.apache.lucene.index.MergePolicy$OneMerge.initMergeReaders(MergePolicy.java:474)
        at 
org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:5190)
        at org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4785)
        at 
org.apache.lucene.index.IndexWriter$IndexWriterMergeSource.merge(IndexWriter.java:6590)
        at 
org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:661)
        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:726)
        Suppressed: java.lang.NullPointerException: Cannot invoke 
"org.apache.lucene.internal.hppc.IntObjectHashMap.clear()" because 
"this.fieldMap" is null
                at 
org.apache.lucene.codecs.lucene103.blocktree.Lucene103BlockTreeTermsReader.close(Lucene103BlockTreeTermsReader.java:277)
                at 
org.apache.lucene.util.IOUtils.closeWhileSuppressingExceptions(IOUtils.java:121)
                at 
org.apache.lucene.util.IOUtils.closeWhileSuppressingExceptions(IOUtils.java:105)
                at 
org.apache.lucene.codecs.lucene103.blocktree.Lucene103BlockTreeTermsReader.<init>(Lucene103BlockTreeTermsReader.java:237)
                ... 14 more
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