code: public void purgeDeletedSecret(String vaultBaseUrl, String secretName) {
          purgeDeletedSecretWithServiceResponseAsync(vaultBaseUrl, secretName).toBlocking().single().body();
      }
docs: Permanently deletes the specified secret.
  The purge deleted secret operation removes the secret permanently, without the possibility of recovery. This operation can only be enabled on a soft-delete enabled vault. This operation requires the secrets/purge permission.
  
  @param vaultBaseUrl The vault name, for example https://myvault.vault.azure.net.
  @param secretName The name of the secret.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws KeyVaultErrorException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent