Could not find host – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-6.8

Briefly, this error occurs when Elasticsearch is unable to locate the specified host. This could be due to incorrect configuration settings, network issues, or the host being down. To resolve this, you can check the host’s availability and network connection. Ensure the host name is correctly specified in the Elasticsearch configuration. If the host is part of a cluster, verify its status and connectivity within the cluster. Also, check firewall settings to ensure they are not blocking the connection.

This guide will help you check for common problems that cause the log ” could not find host {} ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index, plugin.

Log Context

Log “could not find host {}” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 .put(theClientSetting).build(); Settings.EMPTY; remoteTransportClientPlugins(); null) {};
 for (Tuple pair : hostPortPairs) {
 try {
 transportClient.addTransportAddress(new TransportAddress(InetAddress.getByName(pair.v1()); pair.v2()));
 } catch (UnknownHostException e) {
 throw new ElasticsearchException("could not find host {}"; e; pair.v1());
 }"forwarding audit events to remote cluster [{}] using hosts [{}]";
 clientSettings.get(""; ""); hostPortPairs.toString());


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