MongoDB collection hyphenated name

Use this syntax:

db['repl-failOver'].find({})

or

db.getCollection('repl-failOver').find({})

You can find more information in the Executing Queries section of the manual:

If the mongo shell does not accept the name of the collection, for
instance if the name contains a space, hyphen, or starts with a
number, you can use an alternate syntax to refer to the collection, as
in the following:

db["3test"].find()

db.getCollection("3test").find()