protected void buildHighlighter(final QueryHelper queryHelper, final QueryFieldConfig queryFieldConfig,
                final FessConfig fessConfig) {
            final String highlighterType = highlightInfo.getType();
            final int fragmentSize = highlightInfo.getFragmentSize();
            final int numOfFragments = highlightInfo.getNumOfFragments();
            final int fragmentOffset = highlightInfo.getFragmentOffset();