TestIndexWriterDelete#testDeleteAllNoDeadLock fails sometimes on nightly

2> NOTE: reproduce with: ant test  -Dtestcase=TestIndexWriterDelete -Dtests.method=testDeleteAllNoDeadLock -Dtests.seed=E595F5BCCD45156B -Dtests.nightly=true -Dtests.slow=true -Dtests.badapples=true -Dtests.linedocsfile=/l/simon/lucene/test-framework/src/resources/org/apache/lucene/util/2000mb.txt.gz -Dtests.locale=da-DK -Dtests.timezone=SST -Dtests.asserts=true -Dtests.file.encoding=UTF-8
  2> aug. 19, 2020 8:24:20 PM com.carrotsearch.randomizedtesting.RandomizedRunner$QueueUncaughtExceptionsHandler uncaughtException
  2> WARNING: Uncaught exception in thread: Thread[Thread-8,5,TGRP-TestIndexWriterDelete]
  2> java.lang.RuntimeException: org.apache.lucene.store.AlreadyClosedException: this DocumentsWriter is closed
  2> 	at __randomizedtesting.SeedInfo.seed([E595F5BCCD45156B]:0)
  2> 	at org.apache.lucene.index.TestIndexWriterDelete$1.run(TestIndexWriterDelete.java:332)
  2> Caused by: org.apache.lucene.store.AlreadyClosedException: this DocumentsWriter is closed
  2> 	at org.apache.lucene.index.DocumentsWriter.ensureOpen(DocumentsWriter.java:202)
  2> 	at org.apache.lucene.index.DocumentsWriter.updateDocuments(DocumentsWriter.java:416)
  2> 	at org.apache.lucene.index.IndexWriter.updateDocuments(IndexWriter.java:1470)
  2> 	at org.apache.lucene.index.IndexWriter.updateDocument(IndexWriter.java:1756)
  2> 	at org.apache.lucene.index.IndexWriter.addDocument(IndexWriter.java:1399)
  2> 	at org.apache.lucene.index.RandomIndexWriter.addDocument(RandomIndexWriter.java:193)
  2> 	at org.apache.lucene.index.TestIndexWriterDelete$1.run(TestIndexWriterDelete.java:326)
  2> 
  2> aug. 19, 2020 8:24:20 PM com.carrotsearch.randomizedtesting.RandomizedRunner$QueueUncaughtExceptionsHandler uncaughtException
  2> WARNING: Uncaught exception in thread: Thread[Thread-7,5,TGRP-TestIndexWriterDelete]
  2> java.lang.RuntimeException: org.apache.lucene.store.AlreadyClosedException: DWPTPool is already closed
  2> 	at __randomizedtesting.SeedInfo.seed([E595F5BCCD45156B]:0)
  2> 	at org.apache.lucene.index.TestIndexWriterDelete$1.run(TestIndexWriterDelete.java:332)
  2> Caused by: org.apache.lucene.store.AlreadyClosedException: DWPTPool is already closed
  2> 	at org.apache.lucene.index.DocumentsWriterPerThreadPool.ensureOpen(DocumentsWriterPerThreadPool.java:134)
  2> 	at org.apache.lucene.index.DocumentsWriterPerThreadPool.newWriter(DocumentsWriterPerThreadPool.java:102)
  2> 	at org.apache.lucene.index.DocumentsWriterPerThreadPool.getAndLock(DocumentsWriterPerThreadPool.java:128)
  2> 	at org.apache.lucene.index.DocumentsWriterFlushControl.obtainAndLock(DocumentsWriterFlushControl.java:445)
  2> 	at org.apache.lucene.index.DocumentsWriter.updateDocuments(DocumentsWriter.java:409)
  2> 	at org.apache.lucene.index.IndexWriter.updateDocuments(IndexWriter.java:1470)
  2> 	at org.apache.lucene.index.IndexWriter.addDocuments(IndexWriter.java:1443)
  2> 	at org.apache.lucene.index.RandomIndexWriter.addDocument(RandomIndexWriter.java:163)
  2> 	at org.apache.lucene.index.TestIndexWriterDelete$1.run(TestIndexWriterDelete.java:326)
  2> 
  2> aug. 19, 2020 8:24:20 PM com.carrotsearch.randomizedtesting.RandomizedRunner$QueueUncaughtExceptionsHandler uncaughtException
  2> WARNING: Uncaught exception in thread: Thread[Lucene Merge Thread #9,5,TGRP-TestIndexWriterDelete]
  2> org.apache.lucene.index.MergePolicy$MergeException: org.apache.lucene.index.CorruptIndexException: Problem reading index. (resource=_di.cfe)
  2> 	at __randomizedtesting.SeedInfo.seed([E595F5BCCD45156B]:0)
  2> 	at org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:703)
  2> 	at org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:694)
  2> Caused by: org.apache.lucene.index.CorruptIndexException: Problem reading index. (resource=_di.cfe)
  2> 	at org.apache.lucene.index.SegmentCoreReaders.<init>(SegmentCoreReaders.java:144)
  2> 	at org.apache.lucene.index.SegmentReader.<init>(SegmentReader.java:83)
  2> 	at org.apache.lucene.index.ReadersAndUpdates.getReader(ReadersAndUpdates.java:171)
  2> 	at org.apache.lucene.index.ReadersAndUpdates.getReaderForMerge(ReadersAndUpdates.java:714)
  2> 	at org.apache.lucene.index.IndexWriter.lambda$mergeMiddle$16(IndexWriter.java:4672)
  2> 	at org.apache.lucene.index.MergePolicy$OneMerge.initMergeReaders(MergePolicy.java:438)
  2> 	at org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4669)
  2> 	at org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4329)
  2> 	at org.apache.lucene.index.IndexWriter$IndexWriterMergeSource.merge(IndexWriter.java:5880)
  2> 	at org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:624)
  2> 	at org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:682)
  2> Caused by: java.nio.file.NoSuchFileException: _di.cfe
  2> 	at org.apache.lucene.store.ByteBuffersDirectory.openInput(ByteBuffersDirectory.java:222)
  2> 	at org.apache.lucene.store.Directory.openChecksumInput(Directory.java:157)
  2> 	at org.apache.lucene.store.RawDirectoryWrapper.openChecksumInput(RawDirectoryWrapper.java:41)
  2> 	at org.apache.lucene.codecs.lucene50.Lucene50CompoundReader.readEntries(Lucene50CompoundReader.java:104)
  2> 	at org.apache.lucene.codecs.lucene50.Lucene50CompoundReader.<init>(Lucene50CompoundReader.java:68)
  2> 	at org.apache.lucene.codecs.lucene50.Lucene50CompoundFormat.getCompoundReader(Lucene50CompoundFormat.java:71)
  2> 	at org.apache.lucene.index.SegmentCoreReaders.<init>(SegmentCoreReaders.java:101)
  2> 	... 10 more