lucene

        String docsPath = "inputFiles";
        String indexPath = "indexedFiles";

        Path docDir = Paths.get(docsPath);


        Directory dir = FSDirectory.open(Paths.get(indexPath));

        Analyzer analyzer = new StandardAnalyzer();

        IndexWriterConfig iwc = new IndexWriterConfig();
        iwc.setOpenMode(IndexWriterConfig.OpenMode.CREATE_OR_APPEND);

        IndexWriter writer = new IndexWriter(dir, iwc);

        if (writer != null) {
            writer.deleteAll();
        }

        writer.close();


        IndexReader reader = DirectoryReader.open(dir);

        IndexSearcher searcher = new IndexSearcher(reader);

        QueryParser qp = new QueryParser("contents", analyzer);

        Query query = qp.parse("begin");

        TopDocs hits = searcher.search(query, 10);

        Formatter formatter = new SimpleHTMLFormatter();

        QueryScorer scorer = new QueryScorer(query);

        Highlighter highlighter = new Highlighter(formatter, scorer);

        Fragmenter fragmenter = new SimpleSpanFragmenter(scorer, 10);
        highlighter.setTextFragmenter(fragmenter);

        for (int i = 0; i < hits.scoreDocs.length; i ++) {
            int docid = hits.scoreDocs[i].doc;
            Document doc = searcher.doc(docid);
            String title = doc.get("path");

            System.out.println("Path " + " : " + title);

            String text = doc.get("contents");

            TokenStream stream = TokenSources.getAnyTokenStream(reader, docid, "contents", analyzer);

            String[] frags = highlighter.getBestFragments(stream, text, 10);

            for (String frag : frags) {
                System.out.println("=========================");
                System.out.println(frag);
            }
        }
        dir.close();