The documentation fro the Elog ODB tree here:
The Built-in elog will ignore this key.
If using an Built-in Elog, this key must NOT be present.
I assume this is an artifact from amending the documentation, but it's unclear if
the key has to be removed or not. I.e. if the key exists and is empty, will the
built-in elog work? In what way will it break?