As things are now, is not possible to switch from Datastore to Firestore within the same project. Still, you may operate Firestore in Datastore mode. By creating a Cloud Firestore database in Datastore mode, you can access Cloud Firestore's improved storage layer while keeping Cloud Datastore system behavior. You may find more information of relevance by reading the "Automatic Upgrade to Cloud Firestore" documentation page <https://cloud.google.com/datastore/docs/upgrade-to-firestore>.
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