org.apache.lucene.index.MergePolicy$MergeException: java.nio.file.FileSystemException: /usr/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-5.x/lucene/build/core/test/J3/temp/lucene.index.TestDemoParallelLeafReader 78910BB799798171-001/tempDir-002/segs/6za9dzr2yvnqeaarom3jvpyvp_40/_0_Memory_0.mdvd: Too many open files at __randomizedtesting.SeedInfo.seed([78910BB799798171]:0)
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java.nio.file.FileSystemException: /usr/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-5.x/lucene/build/core/test/J3/temp/lucene.index.TestDemoParallelLeafReader 78910BB799798171-001/tempDir-002/segs/6za9dzr2yvnqeaarom3jvpyvp_40/_0_Memory_0.mdvd: Too many open files
at org.apache.lucene.mockfile.HandleLimitFS.onOpen(HandleLimitFS.java:49)
at org.apache.lucene.mockfile.HandleTrackingFS.callOpenHook(HandleTrackingFS.java:84)
at org.apache.lucene.mockfile.HandleTrackingFS.newOutputStream(HandleTrackingFS.java:157)
at java.nio.file.Files.newOutputStream(Files.java:172)
at org.apache.lucene.store.FSDirectory$FSIndexOutput.
(FSDirectory.java:265) at org.apache.lucene.store.FSDirectory.createOutput(FSDirectory.java:214)
at org.apache.lucene.store.MockDirectoryWrapper.createOutput(MockDirectoryWrapper.java:607)
at org.apache.lucene.store.TrackingDirectoryWrapper.createOutput(TrackingDirectoryWrapper.java:43)
at org.apache.lucene.codecs.memory.MemoryDocValuesConsumer.
(MemoryDocValuesConsumer.java:76) at org.apache.lucene.codecs.memory.MemoryDocValuesFormat.fieldsConsumer(MemoryDocValuesFormat.java:60)
at org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.getInstance(PerFieldDocValuesFormat.java:187)
at org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.addNumericField(PerFieldDocValuesFormat.java:111)
at org.apache.lucene.index.NumericDocValuesWriter.flush(NumericDocValuesWriter.java:90)
at org.apache.lucene.index.DefaultIndexingChain.writeDocValues(DefaultIndexingChain.java:142)
at org.apache.lucene.index.DefaultIndexingChain.flush(DefaultIndexingChain.java:93)
at org.apache.lucene.index.DocumentsWriterPerThread.flush(DocumentsWriterPerThread.java:419)
at org.apache.lucene.index.DocumentsWriter.doFlush(DocumentsWriter.java:503)
at org.apache.lucene.index.DocumentsWriter.flushAllThreads(DocumentsWriter.java:615)
at org.apache.lucene.index.IndexWriter.doFlush(IndexWriter.java:3019)
at org.apache.lucene.index.IndexWriter.flush(IndexWriter.java:2994)
at org.apache.lucene.index.IndexWriter.forceMerge(IndexWriter.java:1678)
at org.apache.lucene.index.IndexWriter.forceMerge(IndexWriter.java:1658)
at org.apache.lucene.index.TestDemoParallelLeafReader$3.reindex(TestDemoParallelLeafReader.java:851)
at org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader.getParallelLeafReader(TestDemoParallelLeafReader.java:397)
at org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader.getCurrentReader(TestDemoParallelLeafReader.java:161)
at org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader$ReindexingMergePolicy$ReindexingOneMerge.getMergeReaders(TestDemoParallelLeafReader.java:535)
at org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:3958)
at org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:3559)
at org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:519)
at org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:557)