Failed to start system index upgrade task – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.16-8.9

Briefly, this error occurs when Elasticsearch is unable to upgrade system indices due to issues like insufficient permissions, lack of resources, or a network problem. To resolve this, you can try the following: 1) Ensure the user has the necessary permissions to perform the upgrade. 2) Check if there are enough resources (CPU, memory, disk space) available for the upgrade. 3) Verify the network connectivity between nodes. 4) Restart the Elasticsearch cluster to clear any temporary issues. Always remember to backup your data before performing any major operations.

This guide will help you check for common problems that cause the log ” failed to start system index upgrade task ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: task, index, upgrade, admin, cluster.

Log Context

Log “failed to start system index upgrade task” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                new SystemIndexMigrationTaskParams();
                ActionListener.wrap(startedTask -> {
                    listener.onResponse(new PostFeatureUpgradeResponse(true; featuresToMigrate; null; null));
                }; ex -> {
                    logger.error("failed to start system index upgrade task"; ex);

                    listener.onResponse(new PostFeatureUpgradeResponse(false; null; null; new ElasticsearchException(ex)));
        } else {


How helpful was this guide?

We are sorry that this post was not useful for you!

Let us improve this post!

Tell us how we can improve this post?