how to go about searching and indexing?

**Question**
We're using hivedb as localstorage for our chat based app similar to WhatsApp. It's a cross-platform flutter app (Android, iOS). We're storing messages in local hivedb and later syncing it with MongoDB in cloud.
We have a requirement to perform instant search for chat messages. As these messages could grow substantially over a period of time I'm hoping to find some scalable solution for searching. I couldn't find any reference in your docs about efficient searching or indexing :(

**Version**
- Platform: iOS, Android