@Override
  public String toString() {
    StringBuilder sb = new StringBuilder();
    sb.append("BlobIndexAdminRequest[")
        .append("Client=")
        .append(clientId)
        .append(", CorrelationId=")
        .append(correlationId)
        .append(", Key=")
        .append(storeKey.getID());
    return sb.toString();
  }
@return the BlobId in string format
ambry-protocol/src/main/java/com/github/ambry/protocol/BlobIndexAdminRequest.java