How to search by strict comparison in Bitrix?

Question

1C-Bitrix

Hello!
How to implement a search in Bitrix without taking into account morphology, by strict comparison, without searching for a part of a word.
That is, if you enter "12" in the search, only "12" was found, and not "1213" or "2112".

Answer 1

It turned out that the search is carried out not only through the titles, but also through the description. Turning off the search by description and announcement - everything worked.
To do this, I added the code to the Init.php file

AddEventHandler("search", "BeforeIndex", "BeforeIndexHandler");
  function BeforeIndexHandler($arFields) {
      $arrIblock = array(айди инфоблока);
      $arDelFields = array("DETAIL_TEXT", "PREVIEW_TEXT") ;
      if (CModule::IncludeModule('iblock') && $arFields["MODULE_ID"] == 'iblock' && in_array($arFields["PARAM2"], $arrIblock) && intval($arFields["ITEM_ID"]) > 0){
      $dbElement = CIblockElement::GetByID($arFields["ITEM_ID"]) ;
      if ($arElement = $dbElement->Fetch()){
          foreach ($arDelFields as $value){
          if (isset ($arElement[$value]) && strlen($arElement[$value]) > 0){
              $arFields["BODY"] = str_replace (CSearch::KillTags($arElement[$value]) , "", CSearch::KillTags($arFields["BODY"]) );
              }
          }
      }
      return $arFields;
      }
  }

And then launched a full re-indexing.