Parent: $root.$constants
| kMongoWriteConcenUnacknowledged | MongoDB does not acknowledge receipt of the write operation |
| kMongoWriteConcernDefault | Write operations block pending acknowledgement from MongoDB |
| kMongoWriteConcernMajority | Write operations block until propagated to a majority of nodes in the replica set |
| kMongoWriteConcernWtag | Write operations block until propaged to the members tagged with a custom write concern |
| n | Write operations block until propagated to at least n replica sets. (Supply a positive integer) |