code: @Override
      public CreateFunctionDefinitionResult createFunctionDefinition(CreateFunctionDefinitionRequest request) {
          request = beforeClientExecution(request);
          return executeCreateFunctionDefinition(request);
      }
docs: Creates a Lambda function definition which contains a list of Lambda functions and their configurations to be
  used in a group. You can create an initial version of the definition by providing a list of Lambda functions and
  their configurations now, or use ''CreateFunctionDefinitionVersion'' later.
  
  @param createFunctionDefinitionRequest
  @return Result of the CreateFunctionDefinition operation returned by the service.
  @throws BadRequestException
  invalid request
  @sample AWSGreengrass.CreateFunctionDefinition
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/greengrass-2017-06-07/CreateFunctionDefinition"
  target="_top">AWS API Documentation</a>