ACF in Search Result

Hello everyone,

I searched for hours not finding a working solution.

For a client website I use a custom search hardcoded to display only post from one specific category and hopefully it works fine !

However, the search doesn’t work with custom field from ACF.
So WordPress look for the keyword in post title and post content but not in the ACF Field of the post.

How can we make the WordPress search work with ACF fields ?

Thank you for your help
Best regards