Machine learning features unavailable after rolling upgrade

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Machine learning features unavailable after rolling upgrade

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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 GET _xpack/usage indicate that X-Pack is enabled.

Symptoms:

  • Errors when you click Machine Learning in Kibana. For example: Jobs list could not be created and An internal server error occurred.
  • Null pointer and remote transport exceptions when you run machine learning APIs such as GET _xpack/ml/anomaly_detectors and GET _xpack/ml/datafeeds.
  • Errors in the log files on the master nodes. For example: unable to install ml metadata upon startup

Resolution:

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.