elasticsearch complement multi input

Question

对于 type 为 completion 的类型, 允许 input 输入数组, 那么查询的时候, text 是依据什么规则从 input 数组中选出的呢?

{
    "text": "zhang san",
    "_index": "mymapping",
    "_type": "_doc",
    "_id": "123",
    "_score": 50.0,
    "_source": {
        "name": {
            "input": [
                "张叁",
                "张三",
                "zhang san"
            ],
            "weight": 50
        }
    }
}