}
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        if (responseFields == null) {
            responseFields = fessConfig.getQueryAdditionalResponseFields(//
                    SCORE_FIELD, //
                    fessConfig.getIndexFieldId(), //
                    fessConfig.getIndexFieldDocId(), //
                    fessConfig.getIndexFieldBoost(), //

    }

    String getQueryAdditionalResponseFields();

    default String[] getQueryAdditionalResponseFields(final String... fields) {
        final List<String> list = new ArrayList<>(fields.length + 10);
        stream(fields).of(stream -> stream.forEach(list::add));
        split(getQueryAdditionalResponseFields(), ",")

     * The value is, e.g.  <br>
     * comment: Additional response fields for queries.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getQueryAdditionalResponseFields();

    /**
     * Get the value for the key 'query.additional.response.fields' as {@link Integer}. <br>
     * The value is, e.g.  <br>
     * comment: Additional response fields for queries.