code: private Set<ConfigurationItem> toConfigurationItems(List<ConfigurationKey> configurationItemMap) {
          ImmutableSet.Builder<ConfigurationItem> configurationItemsBuilder = ImmutableSet.builder();
  
          for (ConfigurationKey key : configurationItemMap) {
              configurationItemsBuilder.add(new ConfigurationItem(key.getKey(), key.getValue()));
          }
  
          return configurationItemsBuilder.build();
      }
docs: Converts a {@code List} of {@code ConfigurationKey}s to a {@code Set} of {@code ConfigurationItem}s.
  
  @param configurationItemMap a {@code List} of {@code ConfigurationKey}s.
  @return a {@code Set} of {@code ConfigurationItem}s.