}

            @Override
            public String getQueryAdditionalDefaultFields() {
                return "";
            }

            @Override
            public String getQueryAdditionalSearchFields() {
                return "";
            }

            @Override
            public String getQueryLanguageMapping() {
                return "en:en,ja:ja";
            }

                return baseConfig.getQueryAdditionalDefaultFields();
            }

            @Override
            public String getQueryAdditionalSearchFields() {
                return baseConfig.getQueryAdditionalSearchFields();
            }

            @Override
            public String getQueryAdditionalSortFields() {
                return baseConfig.getQueryAdditionalSortFields();

            }

            @Override
            public String getQueryAdditionalDefaultFields() {
                return "";
            }

            @Override
            public String getQueryAdditionalSearchFields() {
                return "";
            }

            @Override
            public String getQueryAdditionalFacetFields() {
                return "";
            }

            @Override
            public String[] getQueryAdditionalHighlightedFields(String... fields) {
                return fields;
            }

            @Override
            public String[] getQueryAdditionalSearchFields(String... fields) {
                return fields;
            }

            @Override
            public String[] getQueryAdditionalFacetFields(String... fields) {
                return fields;

            }

            @Override
            public String getQueryAdditionalDefaultFields() {
                return "";
            }

            @Override
            public String getQueryAdditionalSearchFields() {
                return "";
            }

            @Override
            public String getQueryAdditionalFacetFields() {
                return "";
            }

                    fessConfig.getIndexFieldContent());
        }
        if (searchFields == null) {
            searchFields = fessConfig.getQueryAdditionalSearchFields(//
                    INURL_FIELD, //
                    fessConfig.getIndexFieldUrl(), //
                    fessConfig.getIndexFieldDocId(), //
                    fessConfig.getIndexFieldHost(), //

    }

    String getQueryAdditionalSearchFields();

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

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

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