code: public ServiceFuture<SecretBundle> getSecretAsync(String secretIdentifier,
              final ServiceCallback<SecretBundle> serviceCallback) {
          SecretIdentifier id = new SecretIdentifier(secretIdentifier);
          return getSecretAsync(id.vault(), id.name(), id.version() == null ? "" : id.version(), serviceCallback);
      }
docs: Get a specified secret from a given key vault.
  
  @param secretIdentifier
  The URL for the secret.
  @param serviceCallback
  the async ServiceCallback to handle successful and failed
  responses.
  @return the {@link ServiceFuture} object