How can Bitrix search by the property of an infoblock of the File/Multiple type?

Question

1C-Bitrix

Good afternoon.
There are two properties of one infoblock: HTML/text and File (Multiple)
Both property values ​​are involved in the search, reindexing was done.
The text from the HTML/text field in the search is found, but if you enter the name of the file that is loaded in File (Multiple) it does not find it.
What needs to be done to find a product in which a file with a specific name is loaded?
Search code:

spoiler

<?$APPLICATION->IncludeComponent(
   "bitrix:search.page", 
   "search", 
   array(
      "RESTART" => "Y",
      "NO_WORD_LOGIC" => "Y",
      "CHECK_DATES" => "Y",
      "USE_TITLE_RANK" => "Y",
      "DEFAULT_SORT" => "rank",
      "FILTER_NAME" => "",
      "arrFILTER" => array(
         0 => "iblock_aspro_priority_catalog",
         1 => "iblock_aspro_priority_content",
      ),
      "arrFILTER_iblock_aspro_priority_catalog" => array(
         0 => "34",
      ),
      "arrFILTER_iblock_aspro_priority_content" => array(
         0 => "all",
      ),
      "SHOW_WHERE" => "N",
      "SHOW_WHEN" => "N",
      "PAGE_RESULT_COUNT" => "50",
      "AJAX_MODE" => "N",
      "AJAX_OPTION_JUMP" => "Y",
      "AJAX_OPTION_STYLE" => "Y",
      "AJAX_OPTION_HISTORY" => "N",
      "CACHE_TYPE" => "N",
      "CACHE_TIME" => "3600",
      "DISPLAY_TOP_PAGER" => "N",
      "DISPLAY_BOTTOM_PAGER" => "Y",
      "PAGER_TITLE" => "Результаты поиска",
      "PAGER_SHOW_ALWAYS" => "N",
      "PAGER_TEMPLATE" => "",
      "USE_LANGUAGE_GUESS" => "Y",
      "USE_SUGGEST" => "Y",
      "SHOW_RATING" => "",
      "RATING_TYPE" => "",
      "PATH_TO_USER_PROFILE" => "",
      "AJAX_OPTION_ADDITIONAL" => "",
      "COMPONENT_TEMPLATE" => "search",
      "COMPOSITE_FRAME_MODE" => "A",
      "COMPOSITE_FRAME_TYPE" => "AUTO"
   ),
   false
);?>

Answer 1

It is necessary to write the handler in init.php
So I threw it offhand, maybe there is a better way, otherwise in my example I have to make a request for each IB element (this at least increases the reindexing time)

$eventManager = \Bitrix\Main\EventManager::getInstance();
$eventManager->addEventHandler('search', 'BeforeIndex', array('MySearch', 'BeforeIndex'));

class MySearch {
  public static function BeforeIndex($arFields) {
    if(intval($arFields['PARAM2']) > 0 && intval($arFields['ITEM_ID']) > 0 && isset($arFields['BODY'])) {
      \Bitrix\Main\Loader::includeModule('iblock');
      
      $dbRes = CIBlockElement::GetList(array(), array('IBLOCK_ID' => $arFields['PARAM2'], 'ID' => $arFields['ITEM_ID']), false, false, array('PROPERTY_FILE'));
      while($arRes = $dbRes->Fetch()) {
        $arFile = CFile::GetFileArray($arRes['PROPERTY_FILE_VALUE']);
        $arFields['BODY'] .= PHP_EOL.$arFile['ORIGINAL_NAME'];
      }
      
      return $arFields;
    }
  }
}

In the check , instead of > 0, you can specify == ID of the infoblock, if it is necessary for a particular IB Instead , respectivelyintval($arFields['PARAM2']) > 0
array('PROPERTY_FILE')array('PROPERTY_свое ID свойства')