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

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 can resolve issues that cause many errors.

This guide will help you check for common problems that cause the log ” Undefined host-type . Please check your settings. ” to appear. It’s important to understand the issues related to the log, so to get started, read the general overview on common issues and tips related to the Elasticsearch concepts: cloud-azure, discovery, hosts, plugins and repository-azure.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up which analyses ES to pinpoint the cause of many errors and provides suitable actionable recommendations how to resolve them (free tool that requires no installation).

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


Run the Check-Up to get a customized report like this:

Analyze your cluster