MTS-683: Make elasticsearch6 default search engine in Jenkins build

Author: Joan He

app/code/Magento/Catalog/Test/Mftf/Test/AdminCreateVirtualProductWithTierPriceTest.xml

@@ -97,6 +97,10 @@
         <waitForPageLoad stepKey="waitForCategoryPageToLoad"/>
         <see selector="{{StorefrontCategoryMainSection.productLink}}" userInput="{{virtualProductBigQty.name}}" stepKey="seeVirtualProductNameOnCategoryPage"/>
 
+        <!--Run full reindex and clear caches -->
+        <magentoCLI command="indexer:reindex" stepKey="reindex"/>
+        <magentoCLI command="cache:flush" stepKey="flushCache"/>
+
         <!-- Verify customer see created virtual product with tier price(from above step) on storefront page and is searchable by sku -->
         <amOnPage url="{{StorefrontHomePage.url}}" stepKey="goToStorefront"/>
         <waitForPageLoad stepKey="waitForStoreFrontProductPageLoad"/>