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Schema:
{ "fields":
    [ {"name": "version", "type": "int", "doc": "version id"},
      {"name": "isr",
       "type": {"type": "array",
                "items": "int",
                "doc": "an array of the id of replicas in isr"}
      },
      {"name": "leader", "type": "int", "doc": "id of the leader replica"},
      {"name": "controller_epoch", "type": "int", "doc": "epoch of the controller that last updated the leader and isr info"},
      {"name": "leader_epoch", "type": "int", "doc": "epocepoch of the leader"}
    ]
}

Example:
{
  "version": 1,
  "isr": [0,1],
  "leader": 0,
  "controller_epoch": 1,
  "leader_epoch": 0
}