lucy24 - 8:51 pm on Oct 24, 2012 (gmt 0)

They're not indexing it. They're "only" trying to crawl it.

How big is the site overall? If you've got millions of real pages, 1.2 lakhs of "not found" (quick detour to Profile to confirm that comma positioning was intentional) isn't that big a deal. But if you've got ten 404s for every real URL, the googlebot might start getting annoyed. Only yesterday in an unrelated thread, someone mentioned the dreaded "poor technical quality" label. There's probably a descriptive article somewhere.

If the 404s include queries that never occur in real life, it should not be that hard to get rid of them and redirect to the intended URL.