code: @Override
      public DescribeDefaultParametersResult describeDefaultParameters(DescribeDefaultParametersRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeDefaultParameters(request);
      }
docs: <p>
  Returns the default system parameter information for the DAX caching software.
  </p>
  
  @param describeDefaultParametersRequest
  @return Result of the DescribeDefaultParameters operation returned by the service.
  @throws ServiceLinkedRoleNotFoundException
  @throws InvalidParameterValueException
  The value for a parameter is invalid.
  @throws InvalidParameterCombinationException
  Two or more incompatible parameters were specified.
  @sample AmazonDax.DescribeDefaultParameters
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/dax-2017-04-19/DescribeDefaultParameters" target="_top">AWS
  API Documentation</a>