List<IndexEntry> addPutEntries(int count, long size, long expiresAtMs) throws StoreException {
    return addPutEntries(count, size, expiresAtMs, MessageInfo.LIFE_VERSION_FROM_FRONTEND);
  }
Adds {@code count} number of put entries each of size {@code size} and that expire at {@code expiresAtMs} to the
index (both real and reference).
@param count the number of PUT entries to add.
@param size the size of each PUT entry.
@param expiresAtMs the time at which each of the PUT entries expires.
@return the list of the added entries.
@throws StoreException
ambry-store/src/test/java/com/github/ambry/store/CuratedLogIndexState.java