Hi Cemil,
Actually, it might be possible. I assume you are using the index table engine? (otherwise the result is probably not matched from a specific beaver module, but the keyword is found elsewhere)
I am not exactly sure how beaver modules work, but if each module acts as a shortcode, then there is hope. On the index table addvanced options panel, there is a field to enter shortcodes to exclude. If you put the beaver builder posts module shortcode there, and then recreate the index, then it may work – although I have no clue what that shortcode is, or if that is indeed a shortcode.