Execute JavaScript that is contained on fetched pages and that might
alter or generate the page content and URLs.
Note that the JavaScript engine in the Search Appliance has limited
functionality. Additionally, while a browser need only maintain the
current JavaScript/DOM state of a page, a crawler ideally needs
to know all possible states - often triggered by events from a
user that does not exist - in order to find all dynamic links on a
page; this may not be feasible. Thus, even with JavaScript enabled,
many JavaScript-derived links and/or content may still not be found.