code: public Observable<DeletedKeyBundle> getDeletedKeyAsync(String vaultBaseUrl, String keyName) {
          return getDeletedKeyWithServiceResponseAsync(vaultBaseUrl, keyName).map(new Func1<ServiceResponse<DeletedKeyBundle>, DeletedKeyBundle>() {
              @Override
              public DeletedKeyBundle call(ServiceResponse<DeletedKeyBundle> response) {
                  return response.body();
              }
          });
      }
docs: Gets the public part of a deleted key.
  The Get Deleted Key operation is applicable for soft-delete enabled vaults. While the operation can be invoked on any vault, it will return an error if invoked on a non soft-delete enabled vault. This operation requires the keys/get permission.
  
  @param vaultBaseUrl The vault name, for example https://myvault.vault.azure.net.
  @param keyName The name of the key.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the DeletedKeyBundle object