Lost : what is Code Search for?

I am using Cody in PyCharm, using the Pro plan.
What is Codesearch? I can’t search my private github repositories; they are not visible. The FAQs don’t help. I see hints that an enterprise plan is needed for searching private repositories.
Is Codesearch useless under the $9 month Cody plan … is Cody AI a replacement for codesearch?