<?php
$searchOrder  = "relevance";
$searchDirection = ($searchDir == "desc") ? SortOrder::SORT_DESC : SortOrder::SORT_ASC;

$this->_searchCriteriaBuilder->addSortOrder($searchOrder, $searchDirection);
$searchCriteria = $this->_searchCriteriaBuilder->setCurrentPage($page)->setPageSize($pageSize)->create();
$products = $this->_productRepository->getList($searchCriteria);
$products = $products->getItems();
?>