Semantic index the brain?

[Christoph1085]

Do I understand correctly that Semantic index is the brain of the copilot. If I am right can I reset  the semantic index after a proof of concept to restart with a fresh one? 

[#2]

https://learn.microsoft.com/en-us/microsoftsearch/semantic-index-for-copilot
Cannot reset semantic index and it's only available if active Copilot license is available in the tenant.