code: public KeyBundle recoverDeletedKey(String vaultBaseUrl, String keyName) {
          return recoverDeletedKeyWithServiceResponseAsync(vaultBaseUrl, keyName).toBlocking().single().body();
      }
docs: Recovers the deleted key to its latest version.
  The Recover Deleted Key operation is applicable for deleted keys in soft-delete enabled vaults. It recovers the deleted key back to its latest version under /keys. An attempt to recover an non-deleted key will return an error. Consider this the inverse of the delete operation on soft-delete enabled vaults. This operation requires the keys/recover permission.
  
  @param vaultBaseUrl The vault name, for example https://myvault.vault.azure.net.
  @param keyName The name of the deleted key.
  @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
  @return the KeyBundle object if successful.