...

Note that the replication factor may not be larger than the number of available Kafka brokers in the cluster. In such cases, Kafka Connect will be unable to create the topics and will fail with an error stating this limitation, and the user will need to explicitly set the aforementioned configurations.

It is not a mistake that a config.storage.partitions configuration property is not mentioned above, since such a configuration property is not useful as the configuration storage mechanism requires a single partition.

Compatibility, Deprecation, and Migration Plan

...