protected String index;
    protected SuggestSettings settings;

    protected String[] supportedFields;
    protected String[] tagFieldNames;
    protected String roleFieldName;
    protected String langFieldName;
    protected String[] badWords;
    protected boolean parallel;

    protected ReadingConverter readingConverter;
    protected ReadingConverter contentsReadingConverter;
    protected Normalizer normalizer;

        public static final String TAG_FIELD_NAME = "tagFieldName";
        public static final String ROLE_FIELD_NAME = "roleFieldName";
        public static final String LANG_FIELD_NAME = "langFieldName";
        public static final String PARALLEL_PROCESSING = "parallel";
        public static final String MAX_CONTENT_LENGTH = "maxContextLength";

        private DefaultKeys() {
        }
    }