code: @Override
      public GetGatewayGroupResult getGatewayGroup(GetGatewayGroupRequest request) {
          request = beforeClientExecution(request);
          return executeGetGatewayGroup(request);
      }
docs: <p>
  Retrieves the details of a gateway group.
  </p>
  
  @param getGatewayGroupRequest
  @return Result of the GetGatewayGroup operation returned by the service.
  @throws NotFoundException
  The resource is not found.
  @sample AmazonAlexaForBusiness.GetGatewayGroup
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/alexaforbusiness-2017-11-09/GetGatewayGroup"
  target="_top">AWS API Documentation</a>