java.lang.AssertionError: org.eclipse.rdf4j.repository.RepositoryException: org.eclipse.rdf4j.sail.SailException: org.apache.lucene.store.AlreadyClosedException: this IndexReader is closed

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org.eclipse.rdf4j.repository.RepositoryException: org.eclipse.rdf4j.sail.SailException: org.apache.lucene.store.AlreadyClosedException: this IndexReader is closed
org.apache.lucene.store.AlreadyClosedException: this IndexReader is closed	at org.apache.lucene.index.IndexReader.ensureOpen(IndexReader.java:274)	at org.apache.lucene.index.SegmentReader.getPostingsReader(SegmentReader.java:227)	at org.apache.lucene.index.CodecReader.fields(CodecReader.java:102)	at org.apache.lucene.index.LeafReader.terms(LeafReader.java:207)	at org.apache.lucene.index.LeafReader.termDocsEnum(LeafReader.java:318)	at org.eclipse.rdf4j.sail.lucene.LuceneIndex.addDocuments(LuceneIndex.java:461)	at org.eclipse.rdf4j.sail.lucene.LuceneIndex.getDocuments(LuceneIndex.java:452)	at org.eclipse.rdf4j.sail.lucene.LuceneIndex.getDocuments(LuceneIndex.java:338)	at org.eclipse.rdf4j.sail.lucene.AbstractSearchIndex.addRemoveStatements(AbstractSearchIndex.java:237)	at org.eclipse.rdf4j.sail.lucene.LuceneSailConnection.addRemoveStatements(LuceneSailConnection.java:251)	at org.eclipse.rdf4j.sail.lucene.LuceneSailConnection.commit(LuceneSailConnection.java:217)	at org.eclipse.rdf4j.repository.sail.SailRepositoryConnection.commit(SailRepositoryConnection.java:169)	at org.eclipse.rdf4j.repository.base.AbstractRepositoryConnection.conditionalCommit(AbstractRepositoryConnection.java:366)	at org.eclipse.rdf4j.repository.base.AbstractRepositoryConnection.add(AbstractRepositoryConnection.java:491)	at org.eclipse.rdf4j.sail.lucene.AbstractLuceneSailTest$1.run(AbstractLuceneSailTest.java:1063)	at java.lang.Thread.run(Thread.java:745)