Hi Jean
I think i have the answer to this query of yours

“If I create the topic myself before launching the connector, then I can have as many partitions as I need. I wish the connector could accept configuration to do it itself.”

I used something like
“topic.creation.enable”: “true”,
“topic.creation.default.replication.factor”: 1,
“topic.creation.default.partitions”: 1

Hope it helps you !