Failed to deserialize response from – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.1-8.2

Briefly, this error occurs when Elasticsearch is unable to convert the response from a handler (like a plugin or module) back into a usable format. This could be due to a mismatch in versions, corrupted data, or a bug in the handler. To resolve this issue, you can try updating or reinstalling the handler, checking for data corruption, or debugging the handler to find and fix any potential bugs.

This guide will help you check for common problems that cause the log ” Failed to deserialize response from [{}] ” 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 response from [{}]” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

        } catch (Exception e) {
            final TransportException serializationException = new TransportSerializationException(
                "Failed to deserialize response from handler [" + handler + "]";
            logger.warn(new ParameterizedMessage("Failed to deserialize response from [{}]"; remoteAddress); serializationException);
            assert ignoreDeserializationErrors : e;
            handleException(handler; serializationException);
        final String executor = handler.executor();


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