This is wrong. You will end up with a lot of processes running in parallel.
You should use:
* * * * * bash /fscrawler.sh jobs --restart --loop 1
Well. If you don't use --restart option, any time you launch again fscrawler, it should detect files which have been removed in the meantime.
If you use --restart I think that it will not detect files removal. But that's a guess as I never tested that.
loop has no effect on detection. It's only there to exit after a given number of runs.