title: lucene deleteDocuments not working
body: <blockquote>
  <pre><code>    /** **************建立索引************************** */
      // 索引文件目录
  </code></pre>
  </blockquote>
  
  <pre><code>//        Directory indexDir = new SimpleFSDirectory(new File("D:" + File.separator + "testindex"));
          Directory indexDir =  new RAMDirectory();
  
          System.out.println("当前lucene的版本号是---" + Version.LUCENE_45);
  
          Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_45);
  
          // 写索引的配置
          IndexWriterConfig writerConfig = new IndexWriterConfig(Version.LUCENE_45, analyzer);
  
          // 每一次都会进行创建新的索引,第二次删掉原来的创建新的索引
          writerConfig.setOpenMode(OpenMode.CREATE_OR_APPEND);
  
          IndexWriter indexWriter = new IndexWriter(indexDir, writerConfig);
  
          Document document = new Document();
  
          Field stringField = new TextField("int1", "hello lucky boy", Store.YES);
  
          Reader reader = new StringReader("hello lucky boy");
  
          /** ****************创建索引时查看分词的结果************* ****** */
          TokenStream tokenStream = analyzer.tokenStream("", reader);
  
          tokenStream.reset();
  
          CharTermAttribute charTermAttr = tokenStream.getAttribute(CharTermAttribute.class);
  
          System.out.println("tokenStream......" + tokenStream);
  
          System.out.print("....分词开始....");
  
          while (tokenStream.incrementToken())
          {
  
              System.out.print(charTermAttr + "----");
  
          }
          System.out.print("....分词结束....");
  
          document.add(stringField);
  
          indexWriter.addDocument(document);
  
          indexWriter.close();
  
          /*******查询term********/
          IndexReader indexReader = DirectoryReader.open(indexDir);
  
          IndexSearcher searcher = new IndexSearcher(indexReader);
  
          TopDocs docs = searcher.search(new TermQuery(new Term("int1", "boy")), 10);
  
          ScoreDoc[] hits = docs.scoreDocs;
  
          System.out.println("......");
  
          if(null != hits)
          {
  
              System.out.println("...存在查询的结果..."+hits.length);
  
              for(ScoreDoc hit : hits)
              {
  
                  System.out.println("命中的结果是......"+hit);
  
                  Document doc = searcher.doc(hit.doc);
  
                  System.out.println("查询出来的field是......"+doc.get("int1"));
  
              }
  
          }
  
  
          /** *********更新索引文件document********* */
          System.out.println("...更新索引文件开始...");
          Term term = new Term("int1", "lucky");
  
          IndexWriterConfig writerConfig2 = new IndexWriterConfig(Version.LUCENE_45, analyzer);
  
          IndexWriter indexWriter2 = new IndexWriter(indexDir, writerConfig2);
  //        indexWriter2.updateDocument(term, document);
  
          indexWriter2.deleteDocuments(term);
  
          indexWriter2.close();
          System.out.println("......" + document);
  
          System.out.println("...跟新索引文件结束...");
          /** **********跟新索引文件结束**** */
  
  
          /**********update/delete之后的操作*********/
          IndexReader indexReaderUpdate = DirectoryReader.open(indexDir);
  
          IndexSearcher searcherUpdate = new IndexSearcher(indexReader);
  
          TopDocs docsUpdate = searcher.search(new TermQuery(new Term("int1", "hello")), 10);
  
          ScoreDoc[] hitsUpdate = docsUpdate.scoreDocs;
  
          System.out.println("...跟新之后的Search操作...");
  
          if(null != hitsUpdate)
          {
  
              System.out.println("...跟新之后存在查询的结果...");
  
              for(ScoreDoc hit : hitsUpdate)
              {
  
                  System.out.println("命中的结果是......"+hit);
  
                  Document doc = searcher.doc(hit.doc);
  
                  System.out.println("查询出来的field是......"+doc.get("int1"));
  
              }
  
          }
  </code></pre>
  
  <p>I  want to delete the docuemnt,however the deleteDocuments method is not working.The document is still the same.Is there anything wrong?</p>