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this Directory is closed
org.apache.lucene.store.AlreadyClosedException: this Directory is closed	at org.apache.lucene.store.Directory.ensureOpen(Directory.java:255)	at org.apache.lucene.store.FSDirectory.fileExists(FSDirectory.java:548)	at org.apache.lucene.index.SegmentInfo.addIfExists(SegmentInfo.java:574)	at org.apache.lucene.index.SegmentInfo.files(SegmentInfo.java:600)	at org.apache.lucene.index.SegmentInfos.files(SegmentInfos.java:803)	at org.apache.lucene.index.IndexFileDeleter.incRef(IndexFileDeleter.java:458)	at org.apache.lucene.index.IndexWriter.startCommit(IndexWriter.java:5576)	at org.apache.lucene.index.IndexWriter.commit(IndexWriter.java:4160)	at org.apache.lucene.index.IndexWriter.closeInternal(IndexWriter.java:2260)	at org.apache.lucene.index.IndexWriter.close(IndexWriter.java:2204)	at org.apache.lucene.index.IndexWriter.close(IndexWriter.java:2168)	at com.jaeksoft.searchlib.index.WriterLocal.close(WriterLocal.java:94)	at com.jaeksoft.searchlib.index.WriterLocal.optimizeNoLock(WriterLocal.java:321)	at com.jaeksoft.searchlib.index.WriterLocal.optimize(WriterLocal.java:329)	at com.jaeksoft.searchlib.index.IndexSingle.optimize(IndexSingle.java:105)	at com.jaeksoft.searchlib.Client.optimize(Client.java:218)	at com.jaeksoft.searchlib.scheduler.task.TaskOptimizeIndex.execute(TaskOptimizeIndex.java:61)	at com.jaeksoft.searchlib.scheduler.TaskItem.run(TaskItem.java:89)	at com.jaeksoft.searchlib.scheduler.TaskManager.execute(TaskManager.java:221)	at org.quartz.core.JobRunShell.run(JobRunShell.java:216)	at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:549)