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java.lang.AssertionError: 	at org.apache.lucene.index.IndexReader.incRef(IndexReader.java:143)	at proj.zoie.api.ZoieMultiReader.copy(ZoieMultiReader.java:358)	at proj.zoie.api.ZoieMultiReader.copy(ZoieMultiReader.java:38)	at proj.zoie.impl.indexing.internal.SearchIndexManager.getIndexReaders(SearchIndexManager.java:244)	at proj.zoie.impl.indexing.DefaultReaderCache$MaintenanceThread.run(DefaultReaderCache.java:149)