@Override
	public String convertFromText(String value, Class<?> targetType, String optionContext) {
		return value;
	}
Option Context of arguments that want to benefit from this converter should have this suffix present, with the
appended part representing the kind of entity they're interested in (<i>e.g.</i> {@code existing-stream}).
spring-xd-shell/src/main/java/org/springframework/xd/shell/converter/ExistingXDEntityConverter.java