code: public Observable<CertificateOperation> updateCertificateOperationAsync(String vaultBaseUrl, String certificateName, boolean cancellationRequested) {
          return updateCertificateOperationWithServiceResponseAsync(vaultBaseUrl, certificateName, cancellationRequested).map(new Func1<ServiceResponse<CertificateOperation>, CertificateOperation>() {
              @Override
              public CertificateOperation call(ServiceResponse<CertificateOperation> response) {
                  return response.body();
              }
          });
      }
docs: Updates a certificate operation.
  Updates a certificate creation operation that is already in progress. This operation requires the certificates/update permission.
  
  @param vaultBaseUrl The vault name, for example https://myvault.vault.azure.net.
  @param certificateName The name of the certificate.
  @param cancellationRequested Indicates if cancellation was requested on the certificate operation.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the CertificateOperation object