private static final String GEO_PREFIX = "geo.";

    private static final String FACET_PREFIX = "facet.";

    private static final String PDF_DATE = "pdf_date";

    private static final Pattern EMAIL_ADDRESS_PATTERN =
            Pattern.compile("[A-Z0-9._%+-]+@[A-Z0-9.-]+\\.[A-Z]{2,6}", Pattern.CASE_INSENSITIVE);

    public static final String MAPPING_TYPE_DOUBLE = "double";

    public static final String MAPPING_TYPE_DATE = "date";

    public static final String MAPPING_TYPE_PDF_DATE = "pdf_date";

    public static final String PAGING_QUERY_LIST = "pagingQueryList";

    public static final String REQUEST_LANGUAGES = "requestLanguages";