But FYI I've run into some bugs that's preventing new content from being indexed. So you won't see anything new (from about a week ago) until I can find a new method to fetch new posts.
Would it be better if your backend federates with popular instances so they push new posts and comments to your search engine? That way, you don't need to scrape those instances to index their contents (because they'll voluntarily send the contents to you via activitypub).
The issue is that you can't search a ton of servers at once unless you index all their posts. To get a proper search engine someone would not only have to spend the time to code it but also the money to host that beast! :/