DurabilityLevelMajority specifies that a mutation must be replicated (held in memory) to a majority of nodes.

DurabilityLevelMajorityAndPersistOnMaster specifies that a mutation must be replicated (held in memory) to a majority of nodes and also persisted (written to disk) on the active node.

DurabilityLevelNone specifies that no durability level should be applied.

DurabilityLevelPersistToMajority specifies that a mutation must be persisted (written to disk) to a majority of nodes.

DurabilityLevelUnknown specifies that the durability level is not set and will default to the default durability level.

DurabilityLevel specifies the level of synchronous replication to use.