How and when does Google provision Maintenance on the firestore database?
And is there any audit logs for it? Or how notifications can be enabled?

I am a bit confused as to whether a query like the one below counts as one read or 25 reads for Firestore pricing ?

Firestore composite index merging is documented in the Firebase docs. Unfortunately the docs do not specify explicitly in what situation composite indexes can be merged. We can assume the following conditions must be true for index merging to occur:

How can I copy data from one firestore database to another in the same project but different regions?

How can I copy data from one firestore database to another in the same project but different regions?

How can I copy data from one firestore database to another in the same project but different regions?

How can I copy data from one firestore database to another in the same project but different regions?

How can I copy data from one firestore database to another in the same project but different regions?

I’m considering using Firebase and its Cloud Firestore database. I have data in AWS Delta Lake on S3, of which a subset of the data needs to be exported into Cloud Firestore on a daily basis. The data may need to be converted into a form appropriate for Cloud Firestore – e.g. from a single Delta Lake table to one or more Firestore collections/subcollections. Moreover, the data will likely work best with upserts – as there will be some data that will either need to be updated or inserted. My estimate is approximately 100,000 records from my Delta Lake table will be exported to Cloud Firestore on a daily basis. The data in the Cloud Firestore will be read-only once loaded.

I have a video game model where I have a User collection in Firestore where each document has a score field. I want to query to get all users sorted by their score, from highest score to lowest. To do this, I need to index the score field and then I can query all users sorted by their score.