Laravel 数组验证

比如用如下请求内容：

{
    "player":[
        {
            "flpNr":29803066,
            "relEmail":"edwin333@intogolf.nl"
        },
        {
            "flpNr":0,
            "relEmail":""
        },
        {
            "flpNr":0,
            "relEmail":""
        },
}

需要验证，如果player的relEmail不为空需要是合法的邮箱，并且在Relation表中不唯一

下面的写法始终报

$validator = \Illuminate\Support\Facades\Validator::make($request->all(), [
            'player' => "required|array",
            'player.*.relEmail' => 'filled|email|unique:Relation',
        ]);

array:3 [ `"player.1.relEmail" => array:1 [ `0 => "The player.1.relEmail field must have a value."` ]
  "player.2.relEmail" => array:1 [ `0 => "The player.2.relEmail field must have a value."` ]
  "player.3.relEmail" => array:1 [ `0 => "The player.3.relEmail field must have a value."` ]` ]

请问该如何写呢