boolean wasRecentlySeenOrCrcIsNull(MessageInfo info) {
    Long crcInJournal = journal.getCrcOfKey(info.getStoreKey());
    return info.getCrc() == null || crcInJournal == null || info.getCrc().equals(crcInJournal);
  }
Returns true if the given message was recently seen by this Index or crc is null from either {@link MessageInfo} or
{@link Journal}.
@param info the {@link MessageInfo} to check.
@return true if the exact message was recently added to this index; false otherwise.
ambry-store/src/main/java/com/github/ambry/store/PersistentIndex.java