Get a topic for the record. This allows us to get the topic management out of the exporter and
makes it possible to extend the exporter for any kind of topic management and routing schemes.
For eg - manage single topics for default case and send all data to the same topic - manage
multiple topics with reconfiguration and send data to topics based on route extension - manage
multiple topics and send data to topics based on feed labels
Parameters:
data -
Returns:
topic to send the data, if topic is empty, drop the data.