}

        // ContentTitle
        if (viewHelper != null) {
            docMap.put(fessConfig.getResponseFieldContentTitle(), viewHelper.getContentTitle(docMap));
            docMap.put(fessConfig.getResponseFieldContentDescription(), viewHelper.getContentDescription(docMap));
            docMap.put(fessConfig.getResponseFieldUrlLink(), viewHelper.getUrlLink(docMap));

        }
        if (apiResponseFieldSet == null) {
            setApiResponseFields(fessConfig.getQueryAdditionalApiResponseFields(//
                    SCORE_SORT_VALUE, //
                    fessConfig.getResponseFieldContentDescription(), //
                    fessConfig.getResponseFieldContentTitle(), //
                    fessConfig.getResponseFieldSitePath(), //
                    fessConfig.getResponseFieldUrlLink(), //

                        docMap.put(fessConfig.getResponseFieldContentTitle(), viewHelper.getContentTitle(docMap));
                        docMap.put(fessConfig.getResponseFieldContentDescription(), viewHelper.getContentDescription(docMap));
                        docMap.put(fessConfig.getResponseFieldUrlLink(), viewHelper.getUrlLink(docMap));

     * comment: Field name for content description in the response.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getResponseFieldContentDescription();

    /**
     * Get the value for the key 'response.field.url_link'. <br>
     * The value is, e.g. url_link <br>
     * comment: Field name for URL link in the response.