queryScope property

Indexes with a collection query scope specified allow queries against a collection that is the child of a specific document, specified at query time, and that has the same collection id.

Indexes with a collection group query scope specified allow queries against all collections descended from a specific document, specified at query time, and that have the same collection id as this index. Possible string values are:

• "QUERY_SCOPE_UNSPECIFIED" : The query scope is unspecified. Not a valid option.
• "COLLECTION" : Indexes with a collection query scope specified allow queries against a collection that is the child of a specific document, specified at query time, and that has the collection id specified by the index.
• "COLLECTION_GROUP" : Indexes with a collection group query scope specified allow queries against all collections that has the collection id specified by the index.
• "COLLECTION_RECURSIVE" : Include all the collections's ancestor in the index. Only available for Datastore Mode databases.