Ask HN: Fully index multiple Git repos

I have a largish collection (100+) of git repos, worked over the last years. I was looking for a tool that would be able to index, commit messages, commit diffs, files, branch names etc, across all the repos. Mainly for being able to quickly find commit messages that contain certain keywords, in order to find how I solved something similar in the past (without remembering which project that was).

Only tool I found that does something similar to that is SourceGraph, but alas, they limit searches against the commit messages to 50 repos only, claiming that the search is too "wide" otherwise.

Are there no tools that can do something similar like this? I have failed to find such a tool...