Undefined host type Please check your settings – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 2.3-2.3

Briefly, this error occurs when Elasticsearch cannot identify the host type due to incorrect or missing configuration in the settings. This could be due to a syntax error, incorrect host name, or missing host type in the Elasticsearch configuration file. To resolve this issue, you can: 1) Check the Elasticsearch configuration file for any syntax errors and correct them. 2) Verify the host name and ensure it is correctly defined. 3) Ensure the host type is correctly specified in the settings. 4) Restart Elasticsearch after making the necessary corrections.

This guide will help you check for common problems that cause the log ” undefined host_type [{}]. Please check your settings. ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: cloud-azure, discovery, hosts, plugins and repository-azure.

Log Context

Log “undefined host_type [{}]. Please check your settings.” classname is AzureUnicastHostsProvider.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                             logger.trace("no public ip provided. ignoring [{}]..."; instance.getInstanceName());
                        // This could never happen!
                        logger.warn("undefined host_type [{}]. Please check your settings."; hostType);
                        return cachedDiscoNodes;

                if (networkAddress == null) {
                    // We have a bad parameter here or not enough information from azure


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