MC-19451: Adapt functional tests to Elasticsearch

Author: Joan He

app/code/Magento/CatalogSearch/Test/Mftf/Test/StorefrontAdvancedSearchEntitySimpleProductTest.xml

@@ -27,6 +27,10 @@
             <deleteData createDataKey="createProduct" stepKey="deleteProduct"/>
         </after>
 
+        <!-- Perform reindex and flush cache -->
+        <magentoCLI command="indexer:reindex" stepKey="reindex"/>
+        <magentoCLI command="cache:flush" stepKey="flushCache"/>
+
         <!-- 1. Navigate to Frontend -->
         <actionGroup ref="StorefrontOpenHomePageActionGroup" stepKey="goToStorefront"/>