unchangedNames property
A bloom filter that, despite its name, contains the UTF-8 byte encodings
of the resource names of ALL the documents that match target_id, in the
form
projects/{project_id}/databases/{database_id}/documents/{document_path}.
This bloom filter may be omitted at the server's discretion, such as if it is deemed that the client will not make use of it or if it is too computationally expensive to calculate or transmit. Clients must gracefully handle this field being absent by falling back to the logic used before this field existed; that is, re-add the target without a resume token to figure out which documents in the client's cache are out of sync.
Implementation
BloomFilter? unchangedNames;