What's so hard about searching chat history? If you just use in:chat, that works fine for me. For anything else, just using in:all usually surfaces threads with

What's so hard about searching chat history? If you just use in:chat, that works fine for me. For anything else, just using in:all usually surfaces threads with the relevant terms, although you can also filter out stuff in the social and promotion tabs if you don't want results from mailing lists or whatever. There are a few advanced search operators that should be there that are missing, like finding the threads with the most number of messages. And the APIs are missing some functionality also, but overall it seems to work pretty well.