SQL LIKE operator in Firebase Cloud Firestore ?
SQL LIKE operator in Cloud Firestore?
https://www.iditect.com/how-to/56653285.html
Filter by search keyword in cloud firestore query
https://medium.com/feedflood/filter-by-search-keyword-in-cloud-firestore-query-638377bf0123
Quotas and limits:
https://firebase.google.com/docs/functions/quotas