Probably the closest things I could find would be :
Both could be of use in understanding Full-Text Search more -- though there
is not much specific on what is the risk of stopping the service.
Basically, I'd be careful in just stopping the service unless you really
need to -- since that can be quite disruptive; however, the gatherer does
know where it left off (this is SQL2000, right?) and picks up where it
stopped when the service comes back.
Microsoft Corp. - SQL Server Engine