Installed template – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.7-8.9

Briefly, this error occurs when Elasticsearch encounters an issue while installing a template. This could be due to incorrect template syntax, insufficient permissions, or a conflict with an existing template. To resolve this, ensure the template syntax is correct and you have the necessary permissions to install templates. If a template with the same name already exists, consider deleting or renaming the existing template before installing the new one. Also, ensure that Elasticsearch is running and the cluster health is green.

This guide will help you check for common problems that cause the log ” Installed template [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, template.

Log Context

Log “Installed template [{}]” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

        final String template = TemplateUtils.loadTemplate(TEMPLATE_RESOURCE; Version.CURRENT.toString(); TEMPLATE_VERSION_SUBSTITUTE);
        final PutIndexTemplateRequest request = new PutIndexTemplateRequest(TEMPLATE_NAME).source(template; XContentType.JSON);
        client.admin().indices().putTemplate(request; ActionListener.wrap(response -> {
  "Installed template [{}]"; TEMPLATE_NAME);
        }; listener::onFailure));

    private boolean isTemplateUpToDate(ClusterState state) {


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