+ key + invalid host: ” + host + ” – Elasticsearch Error How To Solve Related Issues

+ key + invalid host: ” + host + ” – Elasticsearch Error How To Solve Related Issues

Updated: July-20

Elasticsearch Version: 1.7-8.0

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


This guide will help you check for common problems that cause the log ” + key + invalid host: ” + host + “” 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: plugin.

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 discover the cause of many errors and provides suitable actionable recommendations (free tool that requires no installation). 

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 {


Related issues to this log

We have gathered selected Q&A from the community and issues from Github, that can help fix related issues please review the following for further information :

1 Amazon ElasticSearch service Signature mismatch for PUT Request – Amazon SDK php V2 -views 919 ,score 1

Connecting to Elasticsearch – Amazon Elasticsearch service – IAM user -views   839,score 2



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