def unseal(shard)
      json = client.put("/v1/sys/unseal", JSON.fast_generate(
        key: shard,
      ))
      return SealStatus.decode(json)
    end
def unseal(shard)
      json = client.put("/v1/sys/unseal", JSON.fast_generate(
        key: shard,
      ))
      return SealStatus.decode(json)
    end
Unseal the vault with the given shard.

 @example
   Vault.sys.unseal("abcd-1234") #=> #<Vault::SealStatus sealed=true, t=3, n=5, progress=1>

 @param [String] shard
   the key to use

 @return [SealStatus]