code: public void purgeDeleted(String vaultName, String location) {
          purgeDeletedWithServiceResponseAsync(vaultName, location).toBlocking().last().body();
      }
docs: Permanently deletes the specified vault. aka Purges the deleted Azure key vault.
  
  @param vaultName The name of the soft-deleted vault.
  @param location The location of the soft-deleted vault.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws CloudException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent