You may try importing "cloud.google.com/go/datastore" in place of "google.golang.org/appengine/datastore". This solution is given as a reply to the "App Engine Flexible Golang can not access Datastore after successful deployment" question <https://stackoverflow.com/questions/42121697/app-engine-flexible-golang-can-not-access-datastore-after-successful-deployment> in stackoverflow.
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