Could not resolve node external IDs – 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 the node by its external ID. This could be due to a misconfiguration in the cluster settings or a network connectivity issue. To resolve this, you can check the cluster settings and ensure that the node IDs are correctly configured. Also, verify the network connectivity between the nodes. If the issue persists, consider restarting the Elasticsearch service or the entire cluster to refresh the node IDs.

This guide will help you check for common problems that cause the log ” could not resolve node external IDs {} ” 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 external IDs {}” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 var resolvedNodes = -> externalIds.contains(n.getExternalId())).collect(Collectors.toSet());
 if (resolvedNodes.size() < externalIds.size()) {
 // find out which one wasn't found
 var existingExternalIds =;
 throw new ResourceNotFoundException("could not resolve node external IDs {}"; externalIds);
 assert resolvedNodes.size() == request.getExternalIds().length;
 return resolvedNodes;


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