private boolean determineSealStatusForIndexFiles(int index, List<File> indexFiles) {
    return index < indexFiles.size() - 1;
  }
@param index the index of the list of indexFiles.
@param indexFiles a list of file with index entry info.
@return {@code true} if the index file needs to be set to seal status.
ambry-store/src/main/java/com/github/ambry/store/PersistentIndex.java