Could not resolve node names – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 8.6-8.9

Briefly, this error occurs when Elasticsearch is unable to identify or locate the node names specified in the cluster. This could be due to incorrect node names, network issues, or the nodes being down. To resolve this issue, you can verify the node names, check the network connectivity, and ensure that the nodes are up and running. Additionally, check your Elasticsearch configuration for any errors and correct them if necessary.

This guide will help you check for common problems that cause the log ” could not resolve node names {} ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: admin, node, cluster.

Log Context

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

 var resolvedNodes = -> names.contains(n.getName())).collect(Collectors.toSet());
 if (resolvedNodes.size() < names.size()) {
 // find out which one wasn't found
 var existingNodeNames =;
 throw new ResourceNotFoundException("could not resolve node names {}"; names);
 assert resolvedNodes.size() == request.getNames().length;
 return resolvedNodes;
 // Resolve by ID


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