Does anyone know how this discuss search query is being implemented, like how I can recreate some thing like that.

Question

Advice needed

Answer 1

"How this discuss search query is being implemented,"
What query are you talking about? please clarify the question by adding some Description above ☝

Answer 2

Google has a "Programmable Search Engine" that apparently can be used to search your own website. Here is a link to get started:

https://support.google.com/programmable-search/answer/4513751?hl=en&ref_topic=4513742