Hi,
Assuming we use 3 key shares and 2 key threshold, if someone lost his key, how can i rekey only the lost key ? I see on the doc that the rekey process change the total number of key.
Thank you 
I don’t think shamir can work that way. Ie, if you need 2 keys to gen the master key, and you change one, 1 can always be a new/unrelated key.
You need to rekey all, possibly creating a higher # of key shares and storing one away as a failsafe if have a requirement to allow someone to lose their key and give them a new one without rekeying the vault.
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