Unexpected error while deserializing an incoming cluster state – 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 issue while trying to deserialize the incoming cluster state. This could be due to a corrupted cluster state, version incompatibility, or a bug in the software. To resolve this, you can try to restart the Elasticsearch node, ensure all nodes are running the same version of Elasticsearch, or restore the cluster state from a backup. If the error persists, you may need to investigate for possible bugs in the software.

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

Log Context

Log “unexpected error while deserializing an incoming cluster state” classname is PublicationTransportHandler.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                // Close early to release resources used by the de-compression as early as possible
                try (StreamInput input = in) {
                    incomingState = ClusterState.readFrom(input; transportService.getLocalNode());
                    assert input.read() == -1;
                } catch (Exception e) {
                    logger.warn("unexpected error while deserializing an incoming cluster state"; e);
                    assert false : e;
                    throw e;
                logger.debug("received full cluster state version [{}] with size [{}]"; incomingState.version(); request.bytes().length());


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