code: public BoltDeclarer setBolt(String id, IControlBolt bolt, Number parallelism_hint) {
          return setBolt(id, new ControlBoltExecutor(bolt), parallelism_hint);
      }
docs: Define a new bolt in this topology. This defines a control bolt, which is a simpler to use but more restricted kind of bolt. Control bolts are intended for
  making sending control message more simply
  @param id the id of this component. This id is referenced by other components that want to consume this bolt's outputs.
  @param bolt the control bolt
  @param parallelism_hint the number of tasks that should be assigned to execute this bolt. Each task will run on a thread in a process somwehere around
  the cluster.
  @return use the returned object to declare the inputs to this component