public void startBackingOff(long currentTimeMs, long backoffDurationMs) {
        this.backoffTimer.update(currentTimeMs);
        this.backoffTimer.reset(backoffDurationMs);
        this.isBackingOff = true;
    }
Record the current election has failed since we've either received sufficient rejecting voters or election timed out
raft/src/main/java/org/apache/kafka/raft/CandidateState.java