Cloud Firestore equivalent of AppEngine/Datastore Memcache and Keys-only queries?

Question

Using keys-only queries on the datastore and then fetching the entities from memcache is an inexpensive mechanism for reading tons of entities at once. For example, a keys-only query could be made for 1000 keys, which can be used to fetch the entities from memcahce, without having to perform many, if any, datastore reads.

Does/will Cloud Firestore offer anything like this?

Answer 1

Cloud Firestore does not support this. It is something being considered but we have no timeframe to share.