JDBC source connector and connection timeout


I have a multiple JDBC source connectors connecting to a DB2 server. Few of them are on ‘bulk’ mode with a poll interval of 3 days. We are trying to sync some static tables which are hardly modified at source.

Does the DB2 connection get closed after each poll() for the bulk mode?
DBAs are telling me that there are idle connections from Kafka connect cluster. Is it possible to close a connection after each poll() ?