Setting highlightPreTag and highlightPostTag on dashboard doesn't work

I have set highlightPreTag and highlightPostTag in my index dashboard to <span></span> instead of the default <em></em>.

However, after saving the settings change, I can still see my highlighted text be italic. To reproduce, just visit https://onehand.info/ and type 创业 in the search box, you should see highlighted italic .

I wonder why? Do I have to rebuild the whole index after changing a config like this?

The answer is: set Highlight | React InstantSearch | API parameters | API Reference | Algolia Documentation to mark