Magento 2 Search Programatically

public function getSearchedProductIds($searchTerm){
  //$searchTerm = "UKF8001";
  $objectManager = \Magento\Framework\App\ObjectManager::getInstance();
  $searchCriteriaBuilder = $objectManager->create('Magento\Framework\Api\Search\SearchCriteriaFactory');
  $filterBuilder = $objectManager->create('Magento\Framework\Api\FilterBuilder');
  $filterGroupBuilder = $objectManager->create('Magento\Framework\Api\Search\FilterGroupBuilder');
  $searchInterface = $objectManager->create('Magento\Framework\Api\Search\SearchInterface');
  $sortOrder = $objectManager->create('Magento\Framework\Api\SortOrder');
  $search_criteria = $searchCriteriaBuilder->create();
  $search_criteria->setRequestName("quick_search_container");

  $filter = $filterBuilder->setField('search_term')
     ->setValue($searchTerm)
     ->setConditionType("like")  
     ->create();

  $filterGroup = $filterGroupBuilder->addFilter($filter)->create();
  $searchDirection = "desc";
  $page =1;
  //$searchDirection = ($searchDir == "desc") ? SortOrder::SORT_DESC : SortOrder::SORT_ASC;
  $sortOrder->setField('name');
  $sortOrder->setDirection($searchDirection);
  $search_criteria->setFilterGroups([$filterGroup])
   ->setCurrentPage($page);
  $search_criteria->setSortOrders([$sortOrder]);
  $resultx = $searchInterface->search($search_criteria);
  $totalSearchResults = $resultx->getTotalCount();
  $products = $resultx->getItems();
  $result = [];
  foreach ($products as $product) {
   $result[] = $product->getId();
  }
  return $result;
}