Fix `doctrine_search`

app/controllers/concerns/doctrine_search.rb

@@ -23,10 +23,8 @@ module DoctrineSearch
 
       without(:id).any_of(search_params[:exclude_ids]) if search_params[:exclude_ids].present?
 
-      if search_params[:sort_by].blank?
-        order_by :search_year, :desc
-        order_by :search_doc_date, :desc
-        order_by :reference_number, :desc
+      if search_params[:is_group_by_headnote].to_s.eql?("true")
+        group :headnote
       end
 
       paginate page: search_params[:page] || 1, per_page: search_params[:per_page] || 20