Virtual Agent returning irrelevant KB articles

[PriyanshuVerma1]

I have enabled nlu and ai search for the bot. So i understand that if VA doesn't find any topic related to user query, it goes to ai-search fallback and then to contextual search. But in testing I see ai search topic calls contextual search everytime whenever it goes for searching kb articles. 

Also it returns very irrelevant kb articles see below screenshot. It should have not searched at all. How can be improve this

[Lynda1]

I am curious!  Do you have a KB for Dog cat cake?

Was more curious about what our VA would do for that phrase. I have an intent/topic for stuff like that so gives this response.

The response you shared looks like the contextual search response. Do you have the AI Search fallback in the Custom Greetings & Setup / Setup Topics?

AI Search fallback in our environment has "Here's what I found for "user phrase". 

[PriyanshuVerma1]

So the issue was in my ai search topic the search application was not set. Once i set it to "Virtual agent default search", the virtual agent started using ai search. 

Still i don't understand if it was contextual search earlier returning results, still it shouldn't have returned that kb article.