K - key typeV - value type@InterfaceStability.Unstable
public interface ForeachAction<K,V>
ForeachAction interface for performing an action on a key-value
 pair.
 This is a stateless record-by-record operation, i.e, apply(Object, Object) is invoked individually for each
 record of a stream.
 If stateful processing is required, consider using
 KStream#process(...).