Java program to create index and search using Lucene

LuceneExample.java

/* LuceneExample.java */

import java.io.File;
import java.io.FileReader;
import java.io.Reader;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriter.MaxFieldLength;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.store.SimpleFSDirectory;
import org.apache.lucene.util.Version;

public class LuceneExample {

	public static final String files = "C:/TestLucene/files";
	public static final String index = "C:/TestLucene/index";

	public static void createIndex() {

		System.out.println("Creating indexes....");

		Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_30);
		try {
			// Store the index in file

			Directory directory = new SimpleFSDirectory(new File(index));
			IndexWriter iwriter = new IndexWriter(directory, analyzer, true,
					MaxFieldLength.UNLIMITED);
			File dir = new File(files);

			File[] files = dir.listFiles();

			for (File file : files) {
				System.out.println(file.getPath());
				Document doc = new Document();

				doc.add(new Field("path", file.getPath(), Field.Store.YES,
						Field.Index.ANALYZED));

				Reader reader = new FileReader(file.getCanonicalPath());

				doc.add(new Field("contents", reader));
				iwriter.addDocument(doc);
			}

			iwriter.optimize();
			iwriter.close();
		} catch (Exception e) {

			e.printStackTrace();
		}

	}

	public static void searchIndex(String searchString) {

		System.out.println("Searching.... '" + searchString + "'");

		try {
			IndexReader reader = IndexReader.open(FSDirectory.open(new File(
					index)), true);
			IndexSearcher searcher = new IndexSearcher(reader);

			Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_30);// construct our usual analyzer

			QueryParser qp = new QueryParser(Version.LUCENE_30, "contents",
					analyzer);
			Query query = qp.parse(searchString); // parse the query and construct the Query object

			TopDocs hits = searcher.search(query, 100); // run the query

			if (hits.totalHits == 0) {
				System.out.println("No data found.");
			} else {
				for (int i = 0; i < hits.totalHits; i++) {
					Document doc = searcher.doc(hits.scoreDocs[i].doc); // get the next document
					String url = doc.get("path"); // get its path field
					System.out.println("Found in :: " + url);
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public static void main(String[] args) {

		createIndex();
		searchIndex("Object");
	}

}

Only few keywords are searched if i use the above code ... I want every keyword has to be searched in pdf file