/**
 * This method intended for use with
 * <code>testHighlightingWithDefaultField()</code>
 */
private String highlightField(Query query, String fieldName,
    String text) throws IOException, InvalidTokenOffsetsException {
  try (MockAnalyzer mockAnalyzer = new MockAnalyzer(random(), MockTokenizer.SIMPLE,true,
      MockTokenFilter.ENGLISH_STOPSET); TokenStream tokenStream = mockAnalyzer.tokenStream(fieldName, text)) {
    // Assuming "<B>", "</B>" used to highlight
    SimpleHTMLFormatter formatter = new SimpleHTMLFormatter();
    MyQueryScorer scorer = new MyQueryScorer(query, fieldName, FIELD_NAME);
    Highlighter highlighter = new Highlighter(formatter, scorer);
    highlighter.setTextFragmenter(new SimpleFragmenter(Integer.MAX_VALUE));

    String rv = highlighter.getBestFragments(tokenStream, text, 1,
        "(FIELD TEXT TRUNCATED)");
    return rv.length() == 0 ? text : rv;
  }
}