How we can Limit over Search Query

I want to know that there is any way to limit the search query. Actually i have 10 Lakh records in Db. For example if a user search chicken then its search from all data base and generate the pagination. so its generate alot of pages.

I want to just search on 2000 records only. How can i do that. Here is my search function

$input = trim(Input::get('diet_search'));
    $exp = explode(' ', $input);
    $s = '';
    $c = 1;
    foreach ($exp AS $e)
    {
        $s .= "+$e*";
    
        if ($c + 1 == count($exp))
            $s .= ' ';
        $c++;
    }
    $query = "MATCH (diet_name) AGAINST ('$s' IN BOOLEAN MODE)";    
    $result = Diets::whereRaw($query)->paginate(10);
    return view('Front.my_health.health')->with('result',$result);