What are the search and indexing systems for the internal local site of the enterprise?

Question

Search engines

The enterprise has several systems that display data through web views (SVN, GIT, Confluence, and others).
It is necessary to organize a search with indexing on these resources.
Tell me what are "out of the box" solutions for organizing indexing and searching for local web resources (there is no access to the global network)?

Answer 1

You can convert to git repositories and then use the services of Github Enterprise or Gitlab.

Answer 2

https://m.habr.com/ru/post/30594/