Task::processFilterSearchIndex

private function processFilterSearchIndex(array $filter): array
{
	if (!array_key_exists('SEARCH_INDEX', $filter))
	{
		return $filter;
	}

	$searchValue = SearchIndex::prepareStringToSearch($filter['SEARCH_INDEX']);
	if ($searchValue !== '')
	{
		$filter['::SUBFILTER-FULL_SEARCH_INDEX']['*FULL_SEARCH_INDEX'] = $searchValue;
	}

	return $filter;
}