1、方法一，通過Term刪除
Term構造中沒有，Int型別需要轉換成Lucene自帶的類BytesRef 。
    
    /**
     * 根據商品ID刪除索引檔案
     * @param id
     */
    public void deleteDocument(int id)
    {;
        File file = new File("E://index");
        IKAnalyzer analyzer = new IKAnalyzer();
        IndexWriterConfig indexWriterConfig = new IndexWriterConfig(Version.LUCENE_44, analyzer);
        IndexWriter indexWriter = null;
        Directory directory;
        try {
            directory = FSDirectory.open(file);
            // 建立 IndexWriter
            indexWriter = new IndexWriter(directory, indexWriterConfig);
	  	   		BytesRef bytes = new BytesRef(NumericUtils.BUF_SIZE_INT);
                    		NumericUtils.intToPrefixCoded(id, 0, bytes);
                    		Term term = new Term(field, bytes);

           
            indexWriter.deleteDocuments(term);
            indexWriter.close();
           
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            
           
    }

2.方法二，使用NumericRangeQuery

/**
     * 根據商品ID刪除索引檔案
     * @param id
     */
    public void deleteDocument(int id)
    {;
        File file = new File("E://index");


        IKAnalyzer analyzer = new IKAnalyzer();
        IndexWriterConfig indexWriterConfig = new IndexWriterConfig(Version.LUCENE_44, analyzer);


        IndexWriter indexWriter = null;
        


        Directory directory;
        try {
             directory = FSDirectory.open(file);
             // 建立 IndexWriter
             indexWriter = new IndexWriter(directory, indexWriterConfig);
	  	   		Query numbericRangeQuery = NumericRangeQuery.newIntRange("ID",id-1, id+1, false, false);	            
             indexWriter.deleteDocuments(numbericRangeQuery);
             indexWriter.close();
            
             } catch (IOException e) {
                  // TODO Auto-generated catch block
                  e.printStackTrace();
             }           
           
    }