Host list for ” + key + ” is empty but type is ” + type + ” – 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 ” host list for ” + key + ” is empty but type is ” + type + ” ” 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 “host list for [” + key + “] is empty but type is [” + type + “]”classname  is HttpExporter.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

Exporter.TYPE_SETTING.getConcreteSettingForNamespace(namespace).get(Settings.EMPTY);
 if (Objects.equals(type; defaultType)) {
 // hosts can only be empty if the type is unset
 return;
 } else {
 throw new SettingsException("host list for [" + key + "] is empty but type is [" + type + "]");
 }
 } 
 boolean httpHostFound = false;
 boolean httpsHostFound = false;

 

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