private String getIndexingComponents() {
		StringBuilder s = new StringBuilder();
		for (int t = 0, max = indexingElements.size(); t < max; t++) {
			s.append(".");
			s.append(indexingElements.get(t));
		}
		return s.toString();
	}
@author Andy Clement
@author David Turanski
spring-xd-dirt/src/main/java/org/springframework/xd/dirt/stream/dsl/ChannelNode.java