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And the Raft node will respond with either an approval or reject to the pre-vote request in the same way as responding to the normal vote request. Each candidate node will first attempt to send pre-votes to the known quorum members. When it gets the majority of pre-votes approved, the candidate will proceed to the actual vote. If pre-vote fails, the active candidate will not continue to attempt to do the actual vote, instead it will timeout again to start another round of pre-vote candidate, which will not disrupt the live quorum. We may implement a config to constrain number of failed elections for a candidate before self shutting down, but for now human intervention should be good enough. 

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