https://mongoc.org/libmongoc/1.30.8/mongoc_bulkwriteresult_t.html
mongoc_bulkwriteresult_t - libmongoc 1.30.8
https://mongodb.github.io/mongo-csharp-driver/2.13/apidocs/html/P_MongoDB_Driver_BulkWriteResult_1_Acknowledged_IsModifiedCountAvailable.htm
BulkWriteResult(TDocument).Acknowledged.IsModifiedCountAvailable Property
Gets a value indicating whether the modified count is available.
acknowledgedproperty