Answer: Atomic values, descending, Atomic values, ascending

Cloud Firestore automatically generates indexes for atomic values in both ascending and descending orders. Composite indexes, which involve multiple values, require manual creation and do not include single-value variants. Additionally, Cloud Firestore does not utilize hash indexes. For more details, refer to the [Cloud Firestore documentation](https://firebase.google.com/docs/firestore/query-data/index-overview).

Author: LeetQuiz Editorial Team