CDF-M topics are configured in the Kafka Stack Message Collector, which is a record accumulator that writes messages to a single Kafka cluster.
See the Configuration Guide for VMX-Capture (BKDA013) for further background on how the Message Collector fits within the overall architecture of a Stack Probe, and within the context of VMX-Capture as a whole.
The Kafka topic is taken from a datafield. This datafield can be a configured as a static datafield, or generated from a mapper, or some other source.