What do the fields psrsvdgc=x and psrsvdv=x mean? Where do these fields come from and how are they used in the logs?
Those look like the output of the summary indexing si* commands. To use the si commands, you need to mirror the before and after commands exactly. For example, if your summary index is generated with
YourSearch | sistats count by host
Your search off of that index needs to be:
index=yoursummaryindex | stats count by host
(Here's an alternative way to do summary indexing)