code: @Override
      public DescribeEventConfigurationsResult describeEventConfigurations(DescribeEventConfigurationsRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeEventConfigurations(request);
      }
docs: <p>
  Describes event configurations.
  </p>
  
  @param describeEventConfigurationsRequest
  @return Result of the DescribeEventConfigurations operation returned by the service.
  @throws InternalFailureException
  An unexpected error has occurred.
  @throws ThrottlingException
  The rate exceeds the limit.
  @sample AWSIot.DescribeEventConfigurations