public void addHighlightPhrase(String field, List<String> phrase) {
        PhraseItem pi = new PhraseItem();
        pi.setIndexName(field);
        for (String s : phrase)
            pi.addItem(new WordItem(toLowerCase(s), field, true));
        addHighlightItem(field, pi);
    }
Add custom highlight phrase

@param field the field name
@param phrase the list of terms to be highlighted as a phrase
container-search/src/main/java/com/yahoo/prelude/query/Highlight.java