Graylog Log Warning

All,
I just recently tried to upgrade to Graylog v4.0 but unforantly there were unforeseen problems and had to roll back Graylog 3.3.8. Graylog server came back up and no problems were found, except this message repeating it self.

2020-11-18T18:19:05.438-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:08.412-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:08.441-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:11.412-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:11.441-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:14.410-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:14.450-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:17.411-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:17.441-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:20.410-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:20.443-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:23.417-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:23.445-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:26.416-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:26.452-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:29.411-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:29.443-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:32.410-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:32.455-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:35.421-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:35.447-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:38.409-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:38.440-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:41.411-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:41.437-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:44.409-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:44.439-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:47.494-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:47.516-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:50.410-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:50.443-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:53.409-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:53.436-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:56.412-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:56.450-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:59.411-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:19:59.444-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:20:02.411-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:20:02.452-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:20:05.408-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:20:05.436-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:20:08.427-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:20:08.452-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:20:11.410-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:20:11.438-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:20:14.410-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:20:14.443-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:20:17.424-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:20:17.455-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:20:20.407-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:20:20.440-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:20:23.410-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:20:23.438-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:20:26.409-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:20:26.454-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:20:29.409-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:20:29.438-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:20:32.412-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:20:32.450-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:20:35.412-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]
2020-11-18T18:20:35.442-06:00 WARN [NotificationServiceImpl] There is a notification type we can’t handle: [legacy_ldap_config_migration]

Not sure what to expect, plus its filling up the log file.
I looked in Elasticsearch and MongoDB log files, No errors were found.
Everthing seems to be running fine. This si the first time in 4 years I have seen this.

Graylog Environment.

Graylog 3.3.8+e223f85
MongoDB “version": “4.4.1”
Elasticsearch “6.8.12”
CentOS Linux release 7.8.2003 (Core), 8 CPU’s, 8 GB memory, 1TB HDD (Virtual Machine)

Any advice would be apperciated.
Thanks in advance.

Closing this out, I have fully upgrade to Graylog 4.0. Completed no problems.
NOTE; First attempt to upgrade was user error.