@Override
    public void writeToTopology(final InternalTopologyBuilder topologyBuilder) {
        processorParameters.addProcessorTo(topologyBuilder, parentNodeNames());
    }
Used to represent any type of stateless operation:

map, mapValues, flatMap, flatMapValues, filter, filterNot, branch
streams/src/main/java/org/apache/kafka/streams/kstream/internals/graph/ProcessorGraphNode.java