Host list for hostsSetting getKey is empty – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.5-8.9

Briefly, this error occurs when Elasticsearch is unable to find any hosts in the specified host list setting. This could be due to a misconfiguration in the Elasticsearch settings or the host list being empty. To resolve this issue, you can check the Elasticsearch configuration file and ensure that the host list is correctly defined. Alternatively, you may need to add hosts to the list if it’s empty. Also, ensure that the hosts in the list are accessible and running.

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: plugin, hosts.

Log Context

Log “host list for [” + hostsSetting.getKey() + “] is empty” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 final String namespace = TYPE_SETTING.getNamespace(TYPE_SETTING.getConcreteSetting(key));
 final Setting> hostsSetting = HttpExporter.HOST_SETTING.getConcreteSettingForNamespace(namespace);
 final List hosts = (List) settings.get(hostsSetting);
 if (hosts.isEmpty()) {
 throw new SettingsException("host list for [" + hostsSetting.getKey() + "] is empty");
 case "local":