code: private void duplicateDeletion(final String spaceId,
                                     final String contentId)
          throws TaskExecutionFailedException {
  
          if (existsInSourceManifest(spaceId, contentId)) {
              throw new TaskExecutionFailedException(
                  MessageFormat.format("item exists in source manifest and thus appears to be " +
                                       "missing content.  account={0}, storeId={1}, spaceId={2}, contentId={3}",
                                       this.dupTask.getAccount(),
                                       this.dupTask.getSourceStoreId(),
                                       spaceId,
                                       contentId));
          }
  
          log.info("Duplicating deletion of " + contentId + " in dest space " +
                   spaceId + " in account " + dupTask.getAccount());
          try {
              new Retrier().execute(new Retriable() {
                  @Override
                  public String retry() throws Exception {
                      // Delete content
                      destStore.deleteContent(spaceId, contentId);
                      return "success";
                  }
              });
          } catch (Exception e) {
              String msg = "Error attempting to delete content : " + e.getMessage();
              throw new DuplicationTaskExecutionFailedException(buildFailureMessage(msg), e);
          }
  
          log.info("Successfully deleted content item (content_id=" + contentId +
                   ") in dest space (space_id=" + spaceId + ") where account_id=" +
                   dupTask.getAccount());
      }
docs: Deletes a content item in the destination space, but only if it does not exists in the
  source manifest.
  
  @param spaceId
  @param contentId