Auto Suggestion of results in Site Search

Hi there,
I’ve created a help documentation website. I’ve also used site search feature. But I want to implement auto suggestion of results (Elastic Search). How can I do that with site search? Or if it is not possible to do it with site search. What could be the other ways?
Please help.

Read-Only link:

Go to help in navigation menu.


Here is my site Read-Only: LINK
(how to share your site Read-Only link)