This problem occurs after you upgrade all of the nodes in your cluster to
6.2.4 by using rolling upgrades. When you try to use X-Pack machine learning features for
the first time, all attempts fail, though
GET _xpack and
indicate that X-Pack is enabled.
- Errors when you click Machine Learning in Kibana.
Jobs list could not be createdand
An internal server error occurred.
- Null pointer and remote transport exceptions when you run machine learning APIs such as
- Errors in the log files on the master nodes.
unable to install ml metadata upon startup
After you upgrade all master-eligible nodes to Elasticsearch 6.2.4 and X-Pack 6.2.4, restart the current master node, which triggers the X-Pack machine learning features to re-initialize.
For more information, see Rolling upgrades.