ConfigKey invalid host host – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.4

Briefly, this error occurs when the host specified in the Elasticsearch configuration key is invalid. This could be due to a typo, incorrect IP address, or a non-existent domain name. To resolve this issue, you can verify the host’s correctness in the configuration file. Ensure that the IP address or domain name is valid and accessible. If you’re using a domain name, check that it’s correctly resolved to an IP address. If you’re using an IP address, ensure it’s correctly assigned to a running Elasticsearch instance.

This guide will help you check for common problems that cause the log ” [” + configKey + “] invalid host: [” + host + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “[” + configKey + “] invalid host: [” + host + “]” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 final HttpHost httpHost;  try {
 httpHost = HttpHostBuilder.builder(host).build();
 } catch (IllegalArgumentException e) {
 throw new SettingsException("[" + configKey + "] invalid host: [" + host + "]"; e);
 }  if ("http".equals(httpHost.getSchemeName())) {
 httpHostFound = true;
 } else {


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