code: public void unregister(String resourceGroupName, String vaultName, String identityName) {
          unregisterWithServiceResponseAsync(resourceGroupName, vaultName, identityName).toBlocking().single().body();
      }
docs: Unregisters the given container from your Recovery Services vault.
  
  @param resourceGroupName The name of the resource group associated with the Recovery Services vault.
  @param vaultName The name of the Recovery Services vault.
  @param identityName Name of the protection container to unregister.
  @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