Document doc = new Document();
		doc.add(new Field("author_keyword", tk.getAuthorName(), Field.Store.YES, Field.Index.UN_TOKENIZED));
		doc.add(new Field("jtitle_keyword", tk.getJTitle(), Field.Store.YES, Field.Index.UN_TOKENIZED));
		//----------------------------------------------------------	
                doc.add(Field.Text("author", tk.getAuthorName()) ); //partial search for author
	        doc.add(Field.Text("title", tk.getTitle()) );       // okay
		doc.add(Field.Keyword("pubdate", tk.getAbstractDatePublication()) ); //pkay
		doc.add(Field.Text("jtitle", tk.getJTitle()));
		doc.add(Field.Text("so",tk.getSO()));
		doc.add(Field.Text("jid", tk.getJournalId()) );
		doc.add(Field.Keyword("jid", tk.getJournalId()) );
		doc.add(Field.Keyword("mh", tk.getMH()) );
		doc.add(Field.Keyword("filelink", f.getCanonicalPath()));
		doc.add(Field.Keyword("pmid", tk.getPmid()) );
		doc.add(Field.Text("abstract", new FileReader(f)));
		doc.add(Field.UnIndexed("snippet", tk.getSnippet()));
        doc.add(Field.Keyword("author_keyword", tk.getAuthorName()) ); //sort for author
		doc.add(Field.Keyword("jtitle_keyword", tk.getJTitle()));
		//-----------------------------------------------------------