This is not possible with the supplied fetch schedulers so you need a 
customized scheduler.
In Jira there's an open issue for support for different intervals depending on 
MIME-type, it is very similar to what you ask. It extends 
AdaptiveFetchSchedule and allows for setting different increment and decrement 
rates per MIME.

> hi all,
> i want to recrawl siltes with an short interval and file system with long
> interval.
> it means sites have a crawl period different from file system crawl period.
> how can i do that?
> 
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