Could not read transport versions for nodes – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.8-8.9

Briefly, this error occurs when Elasticsearch is unable to read the transport versions for nodes, which is crucial for node-to-node communication. This could be due to network issues, incompatible versions of Elasticsearch on different nodes, or corrupted data. To resolve this, ensure all nodes are running compatible versions of Elasticsearch, check your network connectivity, and verify the integrity of your data. If the problem persists, consider restarting the Elasticsearch service or, in extreme cases, reinstalling Elasticsearch.

This guide will help you check for common problems that cause the log ” Could not read transport versions for nodes {} ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: cluster.

Log Context

Log “Could not read transport versions for nodes {}” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :


            public void onFailure(Exception e) {
                logger.warn("Could not read transport versions for nodes {}"; outstandingNodes; e);
                scheduleRetry(outstandingNodes; retryNum);


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