MC-21737: MySql slow queries on url_rewrite

- Add composite index (entity_id,entity_type) to url_rewrite table

Author: bubasuma

app/code/Magento/UrlRewrite/etc/db_schema.xml

@@ -37,5 +37,8 @@
             <column name="store_id"/>
             <column name="entity_id"/>
         </index>
+        <index referenceId="URL_REWRITE_ENTITY_ID" indexType="btree">
+            <column name="entity_id"/>
+        </index>
     </table>
 </schema>

app/code/Magento/UrlRewrite/etc/db_schema_whitelist.json

@@ -14,11 +14,12 @@
         },
         "index": {
             "URL_REWRITE_TARGET_PATH": true,
-            "URL_REWRITE_STORE_ID_ENTITY_ID": true
+            "URL_REWRITE_STORE_ID_ENTITY_ID": true,
+            "URL_REWRITE_ENTITY_ID": true
         },
         "constraint": {
             "PRIMARY": true,
             "URL_REWRITE_REQUEST_PATH_STORE_ID": true
         }
     }
-}
+}