java - 如何通过替换一些文档来合并旧索引中的新索引

Question

我正在尝试使用 java 程序合并 lucene 索引。我的要求是替换已有的文件并为它合并新文件，我正在使用以下代码。

try{
    File INDEX_DIR= new File("path of first directory");
   INDEX_DIR.mkdir();
   File indexDir = new File("path of first directory");
  Directory indexes[] = new Directory[indexDir.list().length];
   IndexWriter writer = new IndexWriter(
   FSDirectory.open(INDEX_DIR),
   new SimpleAnalyzer(),true,
  IndexWriter.MaxFieldLength.LIMITED); 

 indexes[0] = FSDirectory.open(indexDir);

writer.addIndexes(indexes[0]); 

File indexDir1 = new File("path of second directory");
Directory indexes1[] = new Directory[indexDir1.list().length];

indexes1[0] = FSDirectory.open(indexDir1);

writer.addIndexes(indexes1[0]);
writer.optimize();
  writer.close();   
  System.out.println("index merged");
 }

捕捉（异常前）{

  ex.printStackTrace();
}