code: public Observable<Domain> getDomainAsync(UUID domainId) {
          return getDomainWithServiceResponseAsync(domainId).map(new Func1<ServiceResponse<Domain>, Domain>() {
              @Override
              public Domain call(ServiceResponse<Domain> response) {
                  return response.body();
              }
          });
      }
docs: Get information about a specific domain.
  
  @param domainId The id of the domain to get information about
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the Domain object