code: public static PipelineObjects queryFullPipeline(String rootJobHandle) {
      Key rootJobKey = KeyFactory.createKey(JobRecord.DATA_STORE_KIND, rootJobHandle);
      return backEnd.queryFullPipeline(rootJobKey);
    }
docs: Returns all the associated PipelineModelObject for a root pipeline.
  
  @throws IllegalArgumentException if root pipeline was not found.