Thank you both.
I've been reading the FScrawler web page.
My operating system is on my computer's C drive. My pdf files (to be indexed) are on one NAS. I would like my index to be created on another NAS.
Kibana is stored in c:/kibana
Where should I place my FScrawler snapshot ?
If on the c. drive then how/where to specify the folder containing my pdf files ?