Error sending cluster state to – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch is unable to send the cluster state to a node. This could be due to network issues, node failure, or the node being overwhelmed with requests. To resolve this, you can check the network connectivity between the nodes, ensure the node is functioning properly, or scale up the node if it’s overwhelmed. Additionally, check the OpenSearch logs for more detailed error messages that can help pinpoint the issue.

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This guide will help you check for common problems that cause the log ” error sending cluster state to {} ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: cluster.

Log Context

Log “error sending cluster state to {}” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

                    new ActionListenerResponseHandler(listener; i -> Empty.INSTANCE; ThreadPool.Names.GENERIC)
            } catch (Exception e) {
                logger.warn("error sending cluster state to {}"; node);


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