Thank you!
I know this is just a simple link for you to share but for many others who are following in your footsteps of getting a support site to have a AI bot respond and allowing others to see the interchange of ideas in a public forum this is cutting edge. I know companies are doing this in private but you are doing it publicly. 
I was also happy to see the diagrams as that reaffirmed what I was thinking was correct.
I would not do this.
The bot will not actually search the forum in a manner similar to how text is searched for in post. The keyword and related technology you need to learn for this is Vector Database and Nearest neighbor search.
To see code examples of such being used check out
Wishing you the best with that!