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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.deleteDocumentsNoLock(WriterLocal.java:393)	at com.jaeksoft.searchlib.index.WriterLocal.deleteDocuments(WriterLocal.java:410)	at com.jaeksoft.searchlib.index.IndexSingle.deleteDocuments(IndexSingle.java:148)	at com.jaeksoft.searchlib.Client.deleteDocuments(Client.java:198)	at com.jaeksoft.searchlib.crawler.web.database.UrlManager.updateCrawlTarget(UrlManager.java:621)	at com.jaeksoft.searchlib.crawler.web.database.UrlCrawlQueue.updateCrawls(UrlCrawlQueue.java:191)	at com.jaeksoft.searchlib.crawler.web.database.UrlCrawlQueue.indexWork(UrlCrawlQueue.java:167)	at com.jaeksoft.searchlib.crawler.common.process.CrawlQueueAbstract.index(CrawlQueueAbstract.java:113)	at com.jaeksoft.searchlib.crawler.web.process.WebCrawlMaster.runner(WebCrawlMaster.java:140)	at com.jaeksoft.searchlib.process.ThreadAbstract.run(ThreadAbstract.java:256)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)	at java.lang.Thread.run(Thread.java:679)