}

            @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 "";
            }

    }

    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(), ",")