/// <exception cref="System.IO.IOException"/>
 public virtual void ListAllDocuments()
 {
     SetIndexReaderSearcher();
     for (int i = 0; i < reader.NumDocs(); i++)
     {
         Org.Apache.Lucene.Document.Document d = searcher.Doc(i);
         //      byte[] sent = d.getBinaryValue("tokens").bytes;
         //      List<CoreLabel> tokens = readProtoBufAnnotation(sent);
         System.Console.Out.WriteLine(d.Get("sentid"));
     }
 }