Host list for ” + hostsSetting.getKey() + ” is empty – 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 ” + hostsSetting.getKey() + ” is empty ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: hosts and 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 [” + hostsSetting.getKey() + “] is empty”classname  is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

// if the type is http; then hosts must be set
 final String namespace = TYPE_SETTING.getNamespace(TYPE_SETTING.getConcreteSetting(key));
 final Setting> hostsSetting = HttpExporter.HOST_SETTING.getConcreteSettingForNamespace(namespace);
 @SuppressWarnings("unchecked") final List hosts = (List) settings.get(hostsSetting);
 if (hosts.isEmpty()) {
 throw new SettingsException("host list for [" + hostsSetting.getKey() + "] is empty");
 case "local":


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