Use this function for commands that write such as "drop" or "createRole" (but not for "insert", "update", or "delete", see basic write operations). Write concern and collation can be overridden by various sources. In a transaction, read concern and write concern are prohibited in opts. The highest-priority sources for these options are listed first in the following table. The write concern is omitted for MongoDB before 3.4.

See the example for transactions and for the "distinct" command with opts.