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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)