Kafka sink connector : How to get Kafka message key into document

Working with Data Connectors & Integrations
2

Maybe two SMTs? I bit of a guess here but something like this?

“transforms”: “HoistKey,HoistField”,
“transforms.HoistField.type”: “org.apache.kafka.connect.transforms.HoistField$Value”,
“transforms.HoistField.field”: “id”,
“transforms.HoistKey.type”: “org.apache.kafka.connect.transforms.HoistField$Key”,
“transforms.HoistKey.field”: “payload”,