Lucene: Topdocs index search return zero

Question

Query q = parser.parse(query);
            //Checked;System.out.println(q);
            TopDocs hits = searcher.search(q,numResultsToReturn);
            int test = hits.totalHits;
            System.out.println(test);

The test give result = zero. What may cause this?

1. I believe I set up correct path for indexsearcher.
2. I think I already create the correct index files.

Answer 1

Problem sloved. I use Stringfield instead of "textfield" to be searched. Should textfield. It is designed for key wordsearch.