*/
    public static final String DATE_FORMAT_ISO_8601_EXTEND_UTC = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'";

    /**
     * Digit only date format: yyyyMMddHHmmss
     */
    public static final String DATE_FORMAT_DIGIT_ONLY = "yyyyMMddHHmmss";

    /**
     * Do not instantiate.
     */
    protected CoreLibConstants() {
    }

          <type>String</type>
          <description>When the metadata was last updated (both "groupId/artifactId" and "groupId/artifactId/version" directories). The timestamp is expressed using UTC in the format yyyyMMddHHmmss.</description>
        </field>
        <field xdoc.separator="blank">
          <name>snapshot</name>
          <version>1.0.0+</version>
          <association>
            <type>Snapshot</type>

    private static final String SNAPSHOT = "SNAPSHOT";

    private static final String DEFAULT_SNAPSHOT_TIMESTAMP_FORMAT = "yyyyMMdd.HHmmss";

    private static final String DEFAULT_DATE_FORMAT = "yyyyMMddHHmmss";

    private static String formatDate(Date date, boolean forSnapshotTimestamp) {
        // logic from metadata.mdo, class "Versioning"
        TimeZone timezone = TimeZone.getTimeZone("UTC");

        final boolean runAll = webConfigIds == null && fileConfigIds == null && dataConfigIds == null;

        if (sessionId == null) { // create session id
            final SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
            sessionId = sdf.format(new Date());
        }
        resultBuf.append("Session Id: ").append(sessionId).append("\n");
        resultBuf.append("Web  Config Id:");
        if (webConfigIds == null) {

        return index + ".update";
    }

    private String createIndexName(final String index) {
        return index + '.' + ZonedDateTime.now().format(DateTimeFormatter.ofPattern("yyyyMMddHHmmss"));
    }

    private String getDefaultMappings() throws IOException {
        try (final InputStream is = this.getClass().getClassLoader().getResourceAsStream("suggest_indices/suggest/mappings-default.json")) {

        if (StringUtil.isBlank(options.sessionId)) {
            // use a default session id
            final SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
            options.sessionId = sdf.format(new Date());
        } else {
            options.sessionId = options.sessionId.replace('-', '_');
        }