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

Opster Team

August-23, Version: 8.6-8.9

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Briefly, this error occurs when Elasticsearch is unable to identify the node IDs specified in a command or request. This could be due to incorrect node IDs, nodes being down or inaccessible, or network issues. To resolve this, you can verify the node IDs, ensure all nodes are up and running, and check the network connectivity. If the issue persists, consider checking the cluster health and logs for more detailed information.

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

 var resolvedNode =;
 if (resolvedNode.size() < ids.length) {
 // find out which one wasn't found
 var existingNodeIds =;
 var idsNotFound = -> existingNodeIds.contains(id) == false).collect(Collectors.toSet());
 throw new ResourceNotFoundException("could not resolve node IDs {}"; idsNotFound);
 return resolvedNode;
 // Resolve by external ID
 logger.debug("resolving nodes for prevalidation using external ID");


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