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java.lang.AssertionError: 	at org.apache.lucene.index.IndexReader.incRef(	at proj.zoie.api.ZoieMultiReader.copy(	at proj.zoie.api.ZoieMultiReader.copy(	at proj.zoie.impl.indexing.internal.SearchIndexManager.getIndexReaders(	at proj.zoie.impl.indexing.DefaultReaderCache$