public Optional<VotedState> maybeVotedState() {
        EpochState fixedState = state;
        if (fixedState instanceof VotedState) {
            return Optional.of((VotedState) fixedState);
        } else {
            return Optional.empty();
        }
    }
Become a follower of an elected leader so that we can begin fetching.
raft/src/main/java/org/apache/kafka/raft/QuorumState.java