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我想用java删除lucene 2.4中的文档.我的代码是

  Directory directory = FSDirectory.getDirectory("c:/index");
  IndexReader indexReader = IndexReader.open(directory);
  System.out.println("num="+indexReader.maxDoc());
  indexReader.deleteDocuments(new Term("name","1"));
  System.out.println("num="+indexReader.maxDoc());

 output 
         num=1
         num=1