code: @Override
      Map<String, Object> constructParameterRequestArgs() {
          Map<String, Object> args = new HashMap<String, Object>();
  
          args.put(KeenQueryConstants.PROPERTY_NAME, propertyName);
          args.put(KeenQueryConstants.OPERATOR, operator.toString());
          args.put(KeenQueryConstants.PROPERTY_VALUE, propertyValue);
  
          return args;
      }
docs: Constructs request sub-parameters for the filter.
  
  @return A jsonifiable object