Templates were partially upgraded to version – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch attempts to upgrade index templates to a newer version, but the process is not completed successfully. This could be due to a variety of reasons such as insufficient permissions, network issues, or a bug in the software. To resolve this issue, you could try re-running the upgrade process, ensuring that the user has the necessary permissions, checking the network connectivity, or updating OpenSearch to the latest version to fix any potential bugs.

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This guide will help you check for common problems that cause the log ” Templates were partially upgraded to version {} ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: version, cluster, metadata.

Log Context

Log “Templates were partially upgraded to version {}” classname is TemplateUpgradeService.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :

        assert upgradesInProgress.get() > 0;
        if (upgradesInProgress.decrementAndGet() == 1) {
            try {
                // this is the last upgrade; the templates should now be in the desired state
                if (anyUpgradeFailed.get()) {
                    logger.info("Templates were partially upgraded to version {}"; Version.CURRENT);
                } else {
                    logger.info("Templates were upgraded successfully to version {}"; Version.CURRENT);
                // Check upgraders are satisfied after the update completed. If they still
                // report that changes are required; this might indicate a bug or that something


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