code: public Observable<CertificateOperation> createCertificateAsync(String vaultBaseUrl, String certificateName, CertificatePolicy certificatePolicy, CertificateAttributes certificateAttributes, Map<String, String> tags) {
          return createCertificateWithServiceResponseAsync(vaultBaseUrl, certificateName, certificatePolicy, certificateAttributes, tags).map(new Func1<ServiceResponse<CertificateOperation>, CertificateOperation>() {
              @Override
              public CertificateOperation call(ServiceResponse<CertificateOperation> response) {
                  return response.body();
              }
          });
      }
docs: Creates a new certificate.
  If this is the first version, the certificate resource is created. This operation requires the certificates/create permission.
  
  @param vaultBaseUrl The vault name, for example https://myvault.vault.azure.net.
  @param certificateName The name of the certificate.
  @param certificatePolicy The management policy for the certificate.
  @param certificateAttributes The attributes of the certificate (optional).
  @param tags Application specific metadata in the form of key-value pairs.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the CertificateOperation object