How to delete old index

[Cool Coder]

Hi,
      I used have index refreshed in every 4 hr. However after each refresh, I 
can see two index. I am not sure how can I delete old index.
   
  On starting of indexing process, I create Writer
  writer = new IndexWriter(luceneDirectory,false,luceneAnalyzer,true);
   
  At the end of Indexing process:
  writer.flush();
  writer.close();
   
  and reopen the indexreader
   
  luceneDirectory = FSDirectory.getDirectory(indexPath);
  
  reader = IndexReader.open(luceneDirectory);
  searcher = new IndexSearcher(reader);
  Is this the right way or I am missing something?
  Let me tell you that I dont want to update index rather I just want to delete 
the old index.
  Your help would be appreciated.
   
  - BR

       
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