I'm not trying to claim Telegram uses grep or whatever. My point is even very active chats on telegram generate somewhat small amount of text data and I dont be

I'm not trying to claim Telegram uses grep or whatever. My point is even very active chats on telegram generate somewhat small amount of text data and I dont believe that searching through it require massive complex search engine with super-fast backend. I basically participate in hundreds of chats and message history doesn't take 10 of GBs. And I also know that search in history of such chats isn't so snappy on older Android phone.