+ key + invalid host: ” + host + ” – How to solve this Elasticsearch error

Opster Team

July-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Check-Up which can resolve issues that cause many errors.

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

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up to analyze Elasticsearch configuration and help resolve this error.

Log Context

Log “[” + key + “] invalid host: [” + host + “]”classname  is HttpExporter.java 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 (final IllegalArgumentException e) {
 throw new SettingsException("[" + key + "] invalid host: [" + host + "]"; e);
 if (TYPE.equals(httpHost.getSchemeName())) {
 httpHostFound = true;
 } else {


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