I was looking at the same thing as I was trying to customize the search results. I agree that displaying the meta description should be the default or at least be an option to enable. I noticed that this has been discussed over a year ago here
. Did the suggested method work for you?
Personally, I decided to give up on the build in search capabilities. By default, the result basically sucks. Even the 404 page, the error page and the search page itself (!) were included in the search results, even though I excluded them as described in the docs and the robots meta tag was on the page. The page extracts don't make sense. Adjusting functionality seems ridiculously complex from the examples I have seen. On top of that there are Public Issues that still have not been solved after a very long time. Issue 5274
is exactly 2 years old today! So I don't see how this will ever be upgraded to an acceptable feature.
I decided to move to a Google custom search engine instead. Far better search results, and it was working within a few hours. Unfortunately the non branded version starts at $100/year. I feel that the build-in Sitefinity search features should work, but well.