How to search for the most relevant knowledge base article via API (leveraging AI Search)?

[esguaravkumar]

I have a 3rd party tool in my contact center that has its own Help Desk Agent Web App independent of Service Now.   We integrate it with multiple external ITSM tools.   The Web App also  integrates with Service Now for creating Incidents etc using the table API. 

Now we want to implement a search feature in the Agent Web App.  One of the searches should be a search to Service Now to return the most relevant KB article matching the query provided by the Agent.    We wish to do this via API integration and have the result show in the Agent Web App.

 Service Now Supports two engines for this Zing (old) and AI Search.    This functionality works well in the native web interface of Service Now.

The knowledge api ( https://docs.servicenow.com/en-US/bundle/utah-api-reference/page/integrate/inbound-rest/concept/know... )   exists but is very rudimentary in its search capability.   Its close to keyword search.  It does not produce the same results for KB Match that is available in the native web interface of Service Now.

What API or approach should be use to get the same results that the Service Now Web Interface produces leveraging AI Search (seems to have a built in NLU or advanced search)? 

We want to leverage the knowledge already available in Service Now rather than having to fetch all the KBs and create our own search that leverages modern search concepts.

Is there a new API for getting the AI Search results?
Do we have to create a custom Web Service for this?

Any guidance is appreciated.