I've been searching a bit for how to construct a query for Top Conversations in SWQL Studio, or even just via curl, but haven't been too successful. I did find this thread discussing NTA 3:
Problem getting data using SWQL studio from Orion.Netflow.ConversationsTop NTA 3.11
Is NTA 4 still only using the SOAP interface? Does anyone have pointers for getting data out using a simple tool like curl? Even just getting the Top 5 Conversations over all devices would be a good start.