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

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch is unable to convert the response from a specific source into a usable format. This could be due to incompatible data types, corrupted data, or a bug in the deserialization process. To resolve this issue, you can try the following: 1) Check the data types and ensure they are compatible with OpenSearch. 2) Inspect the data for any corruption or anomalies. 3) Update or patch your OpenSearch to the latest version to fix any potential bugs. 4) Review the deserialization process for any errors or misconfigurations.

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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 OpenSearch concepts: response.

Log Context

Log “Failed to deserialize response from [{}]” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

        } catch (Exception e) {
            final Exception serializationException = new TransportSerializationException(
                "Failed to deserialize response from handler [" + handler + "]";
            logger.warn(new ParameterizedMessage("Failed to deserialize response from [{}]"; remoteAddress); serializationException);
            handleException(handler; serializationException);
        final String executor = handler.executor();
        if (ThreadPool.Names.SAME.equals(executor)) {


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