code: @Override
    public Set<DataSegment> perform(Task task, TaskActionToolbox toolbox)
    {
      return new SegmentTransactionalInsertAction(segments, null, null).perform(task, toolbox).getSegments();
    }
docs: Behaves similarly to
  {@link org.apache.druid.indexing.overlord.IndexerMetadataStorageCoordinator#announceHistoricalSegments},
  with startMetadata and endMetadata both null.