// FindCoordinatorRequest requests the coordinator for a group or transaction.
//
// This coordinator is different from the broker leader coordinator. This
// coordinator is the partition leader for the partition that is storing
// the group or transaction ID.
FindCoordinatorRequest => key 10, max version 4, flexible v3+
  // CoordinatorKey is the ID to use for finding the coordinator. For groups,
  // this is the group name, for transactional producer, this is the
  // transactional ID.
  CoordinatorKey: string // v0-v3
  // CoordinatorType is the type that key is. Groups are type 0,
  // transactional IDs are type 1.
  CoordinatorType: int8 // v1+
  // CoordinatorKeys contains all keys to find the coordinator for.
  CoordinatorKeys: [string] // v4+

// FindCoordinatorResponse is returned from a FindCoordinatorRequest.
FindCoordinatorResponse =>
  ThrottleMillis(2) // v1+
  // ErrorCode is the error returned for the request.
  //
  // GROUP_AUTHORIZATION_FAILED is returned if for a group ID request and the
  // client is not authorized to describe groups.
  //
  // TRANSACTIONAL_ID_AUTHORIZATION_FAILED is returned for a transactional ID
  // request and the client is not authorized to describe transactional IDs.
  //
  // INVALID_REQUEST is returned if not asking for a known type (group,
  // or transaction).
  //
  // COORDINATOR_NOT_AVAILABLE is returned if the coordinator is not available
  // for the requested ID, which would be if the group or transactional topic
  // does not exist or the partition the requested key maps to is not available.
  ErrorCode: int16 // v0-v3
  // ErrorMessage is an informative message if the request errored.
  ErrorMessage: nullable-string // v1-v3
  // NodeID is the broker ID of the coordinator.
  NodeID: int32 // v0-v3
  // Host is the host of the coordinator.
  Host: string // v0-v3
  // Port is the port of the coordinator.
  Port: int32 // v0-v3
  // Coordinators, introduced for KIP-699, is the bulk response for
  // coordinators. The fields in the struct exactly match the original fields
  // in the FindCoordinatorResponse, thus they are left undocumented.
  Coordinators: [=>] // v4+
    Key: string
    NodeID: int32
    Host: string
    Port: int32
    ErrorCode: int16
    ErrorMessage: nullable-string