I have such entity with surrogate PK and unique key based on 3 varchar columns.

public class InvoiceEntity {

    @Id
    @GeneratedValue
    private UUID id;

    @NaturalId
    private InvoiceUniqueKey invoiceId;
}

Using statelessSession.upsert(invoiceEntity) it does generate following sql

merge into invoice as t using (select cast(? as uuid) id ... as s on (t.id=s.id)

So the question is – How can i force hibernate use my unique key(@NaturalId) in merge clause instead of primary key @Id ?

I tried all annotations in hibernate, read docs and found nothing that may make me able to use it this way.