HTTP ERROR 500 when search some words

Hello. I gain problem when try to serach some words.
One of them is "утонула"
https://crimson-land.ru/search?q=%D1%83%D1%82%D0%BE%D0%BD%D1%83%D0%BB%D0%B0

Google Chrome display HTTP ERROR 500.
if search ALL type content of VIDEOS only.
I beleave it caused by some video(s).

The only way I can do is reindex finder content?

I know at the moment one of the moderator check old linked videos (one by one) and delete it. But he do it everyday during 3 months (and still didn't finished). So I can't reindex it in finder everyday.
May be when he delete video, finder index still in system and it cause problem?

Thanks.