Use the servers default read concern.
Return the node's most recent copy of data.
Return the node's most recent copy of data. Provides no guarantee that the data has been written to a majority of the nodes.
Return the node's most recent copy of the data confirmed as having been written to a majority of the nodes.
Construct a new read concern
Construct a new read concern
the read concern level
The readConcern option allows clients to choose a level of isolation for their reads.
1.1
Requires MongoDB 3.2 or greater