In the image attached, I'm passing 4 JSON documents through. The 'Set Properties' shape in the 2nd branch is setting the email address from the 'supervisor' value in the document.
The email is then populated and sent off for each of the 4 documents.
The trouble is for 3 of the 4 documents, the 'Supervisor' is the same, meaning they get 3 emails. It'd be much more efficient if I could somehow group them into one, so only 2 emails are sent out instead of 4.
I'm looking at caching but I just can't get my head around how to do this. Has anyone else experienced something like this?