Easy way to process search results before displaying

You can use pre_get_posts filter to filter out what you need. There’s an example on how to do this in Codex:

https://codex.wordpress.org/Plugin_API/Action_Reference/pre_get_posts#Exclude_Pages_from_Search_Results

function search_filter($query) {
  if ( !is_admin() && $query->is_main_query() ) {
    if ($query->is_search) {
      $query->set('post_type', 'post');
    }
  }
}

add_action('pre_get_posts','search_filter');

Also, this article might get you in the direction of editing the search form…

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