The process_id field requires the process GUID, not the process PID.
1. Obtain the process GUID which can be found on the Process Analysis page or in a raw process document.
a) Process Analysis page:
b) Raw process document:
2. Use the process GUID in the process_id search term.
process_id:00000002-0000-1c2d-01d8-8037b8dee543
Example: