An error occurred during ML maintenance tasks execution – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.8-8.9

Briefly, this error occurs when there are issues with the execution of Machine Learning (ML) maintenance tasks in Elasticsearch. This could be due to insufficient resources, incorrect configurations, or issues with the underlying hardware. To resolve this, you can try increasing the system resources, checking and correcting the ML configurations, or investigating the hardware for any potential issues. Additionally, ensure that the Elasticsearch version is up-to-date and compatible with the ML tasks.

This guide will help you check for common problems that cause the log ” An error occurred during [ML] maintenance tasks execution ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “An error occurred during [ML] maintenance tasks execution” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

    private void triggerAnomalyDetectionMaintenance() {
        // Step 3: Log any error that could have happened
        ActionListener finalListener = ActionListener.wrap(
            unused -> {};
            e -> logger.error("An error occurred during [ML] maintenance tasks execution"; e)

        // Step 2: Delete expired data
        ActionListener deleteJobsListener = ActionListener.wrap(
            unused -> triggerDeleteExpiredDataTask(finalListener);


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