Error sending cluster state to %s – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.3-8.4

Briefly, this error occurs when Elasticsearch has issues in sending the cluster state to a specific node. This could be due to network connectivity issues, node failure, or the node being overwhelmed with requests. To resolve this, you can check the network connection between the nodes, ensure the node is functioning properly, or scale up the node if it’s overwhelmed. Additionally, check the cluster settings and make sure they are correctly configured. If the problem persists, consider restarting the node or the entire cluster.

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

Log Context

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

            } catch (Exception e) {
                assert false : e;
                logger.warn(() -> format("error sending cluster state to %s"; destination); e);