docs: public long[] updateReplicas(TransactionState snapshotTransactionState) {
          long[] replicasAdded = new long[0];
          if (m_replicasUpdatedRequired) {
              tmLog.info(m_whoami + " updated replica list to: "
                      + CoreUtils.hsIdCollectionToString(m_replicas));
              replicasAdded = m_mailbox.updateReplicas(m_replicas, null, snapshotTransactionState);
              m_replicasUpdatedRequired = false;
          }
          return replicasAdded;
      }