issue in searching for a name c# lucine index

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C#

When I search for a name through an interface. the hits list never get anything back( in the try block) its null why.. here is my coding.

IndexSearcher searcher = null;
try
 {
  //added a true parameter, unsure of effects
  //Directory directory = FSDirectory.Open(_indexDirectory);
  //Lucene.Net.Store.FSDirectory directory = FSDirectory.Open(_indexDirectory);
            searcher = new IndexSearcher(_indexDirectory,true);
            //searcher = new IndexSearcher(Directory. , false);
            Hits hits = null;
            try
            {
                hits = searcher.Search(query, new Lucene.Net.Search.Sort());
            }
            catch (BooleanQuery.TooManyClauses)
            {
                //remove the max clause count temporarily
                int maxClauseCount = BooleanQuery.GetMaxClauseCount();
                BooleanQuery.SetMaxClauseCount(int.MaxValue);
                hits = searcher.Search(query, new Lucene.Net.Search.Sort());
                BooleanQuery.SetMaxClauseCount(maxClauseCount);
            }

search method is in a abstract class.

public virtual Hits Search(Query query, Sort sort);

[edit]Code block added - OriginalGriff[/edit]