docs: private CompletableFuture<HeartbeatResponse> handleHeartbeat(HeartbeatRequest request) {
      log.trace("Received {}", request);
      boolean newLeader = !Objects.equals(selectorManager.leader(), request.leader());
      selectorManager.resetAll(request.leader(), request.members());
      HeartbeatResponse response = HeartbeatResponse.builder()
          .withStatus(RaftResponse.Status.OK)
          .build();
      if (newLeader) {
        resetAllIndexes();
      }
      log.trace("Sending {}", response);
      return CompletableFuture.completedFuture(response);
    }