Undefined host-type . Please check your settings. – How to solve related issues

Opster Team

Feb-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you run Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many errors.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

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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