@Override
  public void heartbeat() throws Exception {
    // do nothing
  }
if one event is successfully processed by receiver in PipeConsensus, we will remove this event
from transferBuffer in order to transfer other event.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/pipe/connector/protocol/pipeconsensus/PipeConsensusAsyncConnector.java