Section 1.3 of documentation:
Documented output above the following paragraph shows "Synchronous Get Suceeded: Hello World!"
Much of this output is logging statements produced by the client library, to inform you of what's going on inside the
client library to help you diagnose issues. It says that a connection to Couchbase was added and that the connection state
changed. Then the code shows that the key spoon did not exist in Couchbase which is why the Synchronous Get failed.