code: static void putAdditionalFieldsIntoMap(
              @Nullable Map<String, Object> map,
              @Nullable Map<String, Object> additionalFields) {
          if (map == null || additionalFields == null || additionalFields.isEmpty()) {
              return;
          }
  
          map.putAll(additionalFields);
      }
docs: Put the key-value pairs from the second map into the first map. Note: this does
  not protect against overwriting original values. This method assumes
  a 1-level map.
  
  @param map a {@link Map} into which new values are being written
  @param additionalFields a {@link Map} of key-value pairs to add to the object.