Transform encountered an exception – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.5-8.2

Briefly, this error occurs when Elasticsearch’s transform functionality encounters an issue during data transformation. This could be due to incorrect transform configurations, insufficient resources, or data inconsistencies. To resolve this, you can check the transform configuration for errors, ensure there are enough resources (CPU, memory, disk space) for the operation, and verify the integrity of the data being transformed. If the issue persists, consider checking the Elasticsearch logs for more detailed error information.

This guide will help you check for common problems that cause the log ” [{}] transform encountered an exception: ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “[{}] transform encountered an exception: ” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

     * the lock for TransformTask has been acquired; too. See gh#75846
     * (Note: originally this method was synchronized; which is not necessary)
    void handleFailure(Exception e) {
        logger.warn(new ParameterizedMessage("[{}] transform encountered an exception: "; getJobId()); e);
        Throwable unwrappedException = ExceptionsHelper.findSearchExceptionRootCause(e);

        if (unwrappedException instanceof CircuitBreakingException) {
            handleCircuitBreakingException((CircuitBreakingException) unwrappedException);


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