Getting the number of Hits in a document(doc) in lucene

How can I get the number of Hits per开发者_Go百科 document in Lucene in Java. I have

 
   IndexReader reader;
   reader = IndexReader.open(FSDirectory.open(new File(index)), true);
   Searcher searcher = new IndexSearcher(reader);
   String feild = "contents"
   QueryParser parser = new QueryParser(Version.LUCENE_CURRENT, field,analyzer);
   Query query = parser.parse("test");
   TopScoreDocCollector collector = TopScoreDocCollector.create(
                    5 * hitsPerPage, false);
   searcher.search(query, collector);
   ScoreDoc[] hits = collector.topDocs().scoreDocs;
   Searcher searcher = new IndexSearcher(reader);
   int numTotalHits = collector.getTotalHits();
   System.out.println(numTotalHits + " total matching documents");


for (int i = start; i < end; i++) {
           int id = hits[i].doc;
           TermFreqVector[] Tfv = reader.getTermFreqVectors(id);

The tfv is getting to be null :( Can some one direct on how to get the hits in each document from there.

EDIT:

If we set the TermVector.YES while indexing it works.

You can write custom Similarity implementation. You will gain access to term frequency which will give you number of times given terms occurs in given document.

This is a duplicate of Get search word Hits ( number of occurences) per document in Lucene

As that answer says, you can use the term freq vector. jarekrozanski's answer is faster, but you will need to make a custom similarity class, which you might dislike doing.