Failed node nodeId – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

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Briefly, this error occurs when Elasticsearch cannot communicate with a specific node identified by the “nodeId”. This could be due to network issues, the node being down, or configuration problems. To resolve this, you can check the node’s status and restart it if necessary, ensure the network connectivity is stable, and verify the cluster’s configuration settings. Also, check the Elasticsearch logs for more detailed error information.

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This guide will help you check for common problems that cause the log ” Failed node [” + nodeId + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: node.

Log Context

Log “Failed node [” + nodeId + “]” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 protected void onItemFailure(String nodeId; Exception e) {
 logger.debug(() -> Strings.format("failed to execute on node [{}]"; nodeId); e);
 synchronized (failedNodeExceptions) {
 failedNodeExceptions.add(new FailedNodeException(nodeId; "Failed node [" + nodeId + "]"; e));
 }  @Override
 protected TasksResponse onCompletion() {


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