It's not clear to me what the "non-deprecated" way is from the warning message

replset [direct: secondary] test> rs.secondaryOk()
DeprecationWarning: .setSecondaryOk() is deprecated. Use .setReadPref("primaryPreferred") instead
Setting read preference from "primary" to "primaryPreferred"

especially since I didn't run .setSecondaryOk().

I followed the various tickets (MONGOSH-568 MONGOSH-910) and it looks like the correct thing to do is

db.getMongo().setReadPref('primaryPreferred')

Aside from the fact that this requires me to type a string (instead of using tab complete) which is annoying, setReadPref is not actually an option for db.getMongo().s<tab>

replset [direct: secondary] test> db.getMongo().set
db.getMongo().setImmediate  db.getMongo().setInterval   db.getMongo().setTimeout

So there are two requests in this ticket:

1. Are we committed to deprecating rs.secondaryOk() and making users type approximately 5x as many characters to achieve the same thing?
   • In the mongo shell you can type rs.se<tab>) (7 characters)
2. If so, can we make setReadPref tab completable?