Failed to deserialize exception response from stream – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.9

Briefly, this error occurs when Elasticsearch is unable to convert a serialized exception response back into an object. This could be due to a version mismatch between nodes, or corrupted data. To resolve this, ensure all nodes are running the same Elasticsearch version. If the problem persists, check for corrupted data by running a consistency check on your indices. If the error is still present, consider reindexing your data.

This guide will help you check for common problems that cause the log ” Failed to deserialize exception response from stream ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: response.

Log Context

Log “Failed to deserialize exception response from stream” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 private void handlerResponseError(StreamInput stream; final TransportResponseHandler handler) {
 Exception error;
 try {
 error = stream.readException();
 } catch (Exception e) {
 error = new TransportSerializationException("Failed to deserialize exception response from stream"; e);
 handleException(handler; error);
 }  private void handleException(final TransportResponseHandler handler; Throwable error) {