Unexpected error while checking for node reconnects – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.9

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Briefly, this error occurs when Elasticsearch encounters an unexpected issue while trying to reconnect to a node that was previously disconnected. This could be due to network issues, node failure, or configuration problems. To resolve this, you can try restarting the node, checking the network connection, or reviewing the cluster settings. If the problem persists, you may need to check the Elasticsearch logs for more detailed error information. It’s also important to ensure that your Elasticsearch version is up-to-date, as this could be a bug that’s been fixed in a newer release.

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This guide will help you check for common problems that cause the log ” unexpected error while checking for node reconnects ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: cluster, node.

Log Context

Log “unexpected error while checking for node reconnects” classname is NodeConnectionsService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :


        public void onFailure(Exception e) {
            logger.warn("unexpected error while checking for node reconnects"; e);

        public String toString() {


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