@Override
  public OptionalLong getBulkLoadTimestamp() {
    // we always return false for isBulkLoadResult so we do not have a bulk load timestamp
    return OptionalLong.empty();
  }
A mock used so our tests don't deal with actual StoreFiles
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/MockHStoreFile.java