private void BeginReceiveEntries(EndPoint sender, ReadOnlySpan <byte> announcement, CancellationToken token)
{
lookupIndex = -1;
state = State.AppendEntriesReceived;
EntriesExchange.ParseAnnouncement(announcement, out var remotePort, out var term, out var prevLogIndex, out var prevLogTerm, out var commitIndex, out remainingCount);
ChangePort(ref sender, remotePort);
task = server.ReceiveEntriesAsync(sender, term, this, prevLogIndex, prevLogTerm, commitIndex, token);
}
