Adding legacy template for because it doesn t exist – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.9-7.17

Briefly, this error occurs when Elasticsearch attempts to add a legacy index template because it doesn’t exist in the system. This could be due to a missing or incorrectly configured template. To resolve this issue, you can either create the missing template or correct the existing one. Ensure that the template is properly configured according to the Elasticsearch version you are using. Also, check your Elasticsearch logs for more details about the missing template. Lastly, consider upgrading to the latest version of Elasticsearch, as legacy templates are deprecated in newer versions.

This guide will help you check for common problems that cause the log ” adding legacy template [{}] for [{}]; because it doesn’t exist ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: template, plugin.

Log Context

Log “adding legacy template [{}] for [{}]; because it doesn’t exist” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

            final String templateName = newTemplate.getTemplateName();
            final AtomicBoolean creationCheck = templateCreationsInProgress.computeIfAbsent(templateName; key -> new AtomicBoolean(false));
            if (creationCheck.compareAndSet(false; true)) {
                IndexTemplateMetadata currentTemplate = state.metadata().getTemplates().get(templateName);
                if (Objects.isNull(currentTemplate)) {
          "adding legacy template [{}] for [{}]; because it doesn't exist"; templateName; getOrigin());
                    putLegacyTemplate(newTemplate; creationCheck);
                } else if (Objects.isNull(currentTemplate.getVersion()) || newTemplate.getVersion() > currentTemplate.getVersion()) {
                    // IndexTemplateConfig now enforces templates contain a `version` property; so if the template doesn't have one we can
                    // safely assume it's an old version of the template.


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