2 differnt search engine son 1 wp?

Yes, you can do that. How is the KB section defined? Is it a taxonomy or a post type? Either way, restricting the search is quite easy.

Hi Mikko, thanks for the quick reply.
So I can make 2 search shortcodes? one for site overall search and one for the kb section|?

“How is the KB section defined? Is it a taxonomy or a post type?”
Post type but we still need to build it. I was charmed by doc-it plugin https://www.ads-software.com/plugins/slick-doc-it/ , but it is not compatible with wpml and creates a ugly /doc-it/ map.
Or will it help to only search in kb articles if we use https://www.ads-software.com/plugins/wp-kb-articles/?

So yes I think of building it with pages (chapters) and subpages (sections) and a on page submenu to navigate.

And if I want a big search field above the kb section like on
this kb plugin: https://codecanyon.net/item/knowledge-base-wiki-wordpress-plugin/full_screen_preview/5758910 is that possible?

WPML?
In your features: “Automatic support for WPML multi-language plugin.” This means the search will give only the language results in the language content you are searching for?

Ajax auto fill with image and text
Also I like an ajax auto fill when typing in the search field: you recommend https://www.ads-software.com/plugins/threewp-ajax-search/screenshots/ (laste paragraph installation tab) but that one is outdated? I now use https://www.ads-software.com/plugins/daves-wordpress-live-search/ it alos tell it works with yours. Maybe update that section?

Post type is easy. In the search form for KB posts, add this:

<input type="hidden" name="post_type" value="KB_POST_TYPE" />

(Replace KB_POST_TYPE with the actual name of your KB post type.)

For everything but the KB_POST_TYPE, list all the other post types in a similar hidden input field.

You can have any kind of search form, as long as it behaves the way the default WP search form does. The way it looks like is up to you.

Yes, you’ve understood the WPML feature correctly.

I don’t know which ajax auto fill plugins work with Relevanssi.