Updating existing MFTF test to clear cache

Author: Mohan Ahuja

app/code/Magento/Elasticsearch6/Test/Mftf/Test/StorefrontElasticsearchSearchInvalidValueTest.xml

@@ -46,7 +46,9 @@
             <actionGroup ref="DeleteProductsIfTheyExistActionGroup" stepKey="deleteProduct"/>
             <actionGroup ref="ResetProductGridToDefaultViewActionGroup" stepKey="resetFiltersIfExist"/>
             <comment userInput="Adding the comment to replace CliIndexerReindexActionGroup action group ('indexer:reindex' commands) for preserving Backward Compatibility" stepKey="reindex"/>
-            <comment userInput="Adding the comment to replace CliCacheFlushActionGroup action group ('cache:flush' command) for preserving Backward Compatibility" stepKey="flushCache"/>
+            <actionGroup ref="CliCacheFlushActionGroup" stepKey="flushCache">
+                <argument name="tags" value=""/>
+            </actionGroup>
             <actionGroup ref="AdminLogoutActionGroup" stepKey="logout"/>
         </after>
         <!--Create new searchable product attribute-->