I think this thread has the answers you are looking for; https://lists.apache.org/thread/ckso6nhswlzy7r0zzslw9o8ts78x3yzt

disclaimer: I'm a dev advocate from Datavolo, but we have a PutIcebergTable processor in our runtime and I created a tutorial for it at https://devcenter.datavolo.io/tutorials/populate-iceberg-polaris/ (I know that is NOT what you asked about, but thought I'd share it in case there's some interest at all -- no worries if not).

Good luck!