docs: @BetaApi(
        "The surface for long-running operations is not stable yet and may change in the future.")
    public final OperationFuture<Empty, Struct> batchDeleteEntityTypesAsync(
        ProjectAgentName parent, List<String> entityTypeNames) {
  
      BatchDeleteEntityTypesRequest request =
          BatchDeleteEntityTypesRequest.newBuilder()
              .setParent(parent == null ? null : parent.toString())
              .addAllEntityTypeNames(entityTypeNames)
              .build();
      return batchDeleteEntityTypesAsync(request);
    }