Refer to https://github.com/mongodb/mongoid/pull/5597/files

There is a spec in the file spec/mongoid/clients/options_spec.rb that makes an assertion about the number of DB connections, by asking the DB for the number of connections it has.

The spec is set to retry 3 times (a red flag that it's janky) and even with these retries, it still fails about 1 out of every 10 times. Its easy to repro locally using 100.times { } around the spec.

The PR, I've made a fix which preserves the spirit of the test in the way that doesn't fail--ran it 1000 times without retries and it worked every time.