About "Default Crawler" job

I’m using Fess 14.10.0.
There are some pre-created jobs, I’d like to understand what they are created for?

For example, “Default Crawler” job, what does it do? What directory does it crawl?
What page does it crawl?
Can I configure its operation?

Default Crawler crawls documents by all web/file system/data store configs you created.