docs: public static void dumpConfiguration(Configuration config,
  	                                     String propertyName, Writer out) throws IOException {
  		if(Strings.isNullOrEmpty(propertyName)) {
  			dumpConfiguration(config, out);
  		} else if (Strings.isNullOrEmpty(config.get(propertyName))) {
  			throw new IllegalArgumentException("Property " +
  					propertyName + " not found");
  		} else {
  			JsonFactory dumpFactory = new JsonFactory();
  			JsonGenerator dumpGenerator = dumpFactory.createGenerator(out);
  			dumpGenerator.writeStartObject();
  			dumpGenerator.writeFieldName("property");
  			appendJSONProperty(dumpGenerator, config, propertyName,
  					new ConfigRedactor(config));
  			dumpGenerator.writeEndObject();
  			dumpGenerator.flush();
  		}
  	}