code: public Observable<CertificateBundle> restoreCertificateAsync(String vaultBaseUrl, byte[] certificateBundleBackup) {
          return restoreCertificateWithServiceResponseAsync(vaultBaseUrl, certificateBundleBackup).map(new Func1<ServiceResponse<CertificateBundle>, CertificateBundle>() {
              @Override
              public CertificateBundle call(ServiceResponse<CertificateBundle> response) {
                  return response.body();
              }
          });
      }
docs: Restores a backed up certificate to a vault.
  Restores a backed up certificate, and all its versions, to a vault. This operation requires the certificates/restore permission.
  
  @param vaultBaseUrl The vault name, for example https://myvault.vault.azure.net.
  @param certificateBundleBackup The backup blob associated with a certificate bundle.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the CertificateBundle object