elasticsearch-dsl - how to get sequence number and primary term?

Question

I have a containerised setup. I have a web container running django and separate es container. I am using the following in my web container

• elasticsearch-dsl==7.4.0
• django-elasticsearch-dsl==7.2.2

I have a django model, a document (as per django-elasticsearch-dsl docs) and a view. I can save/query fine. It works

How can I find the sequence number / seq_no and primary term / primary_term of the Document? Neither package's search or response objects contain these (and they aren't mentioned in the docs).