Key: A unique identifier for an entity. If a key's partition ID or any of its path kinds or names are reserved/read-only, the key is reserved/read-only. A reserved/read-only key is forbidden in certain documented contexts.
// IDs. // No key may be reserved/read-only. Keys *Key `json:"keys,omitempty"` // ForceSendFields is a list of field names (e.g. "Keys") to
// with // its key path completed with a newly allocated ID. Keys *Key `json:"keys,omitempty"` // ServerResponse contains the HTTP response code and headers from the
// An entity's kind is its key path's last element's kind, // or null if it has no key. Key *Key `json:"key,omitempty"` // Properties: The entity's properties.