关于查询权重问题，完全命中的store 反而不怎么高

mapping是这样的：


 
数据是这样子的：


 
查询语句是这样子的：

POST http://localhost:9200/robot/_search

{

    "query":{

        "term":{

            "question":"你"

        }

    }    

}

返回结果如下：
 

{

  "took": 6,

  "timed_out": false,

  "_shards": {

    "total": 5,

    "successful": 5,

    "skipped": 0,

    "failed": 0

  },

  "hits": {

    "total": 4,

    "max_score": 1.3626978,

    "hits": [

      {

        "_index": "robot",

        "_type": "brain",

        "_id": "AWAklKdUEXHi548SCMvK",

        "_score": 1.3626978,

        "_source": {

          "question": "你是不是从石头里蹦出来的",

          "answer": "你才是从石头里蹦出来的",

          "create_time": "2017-12-05 10:50:10",

          "user_id": ""

        }

      },

      {

        "_index": "robot",

        "_type": "brain",

        "_id": "AWAkwMmAEXHi548SCMvO",

        "_score": 0.8630463,

        "_source": {

          "question": "你",

          "answer": "你什么你，我叫逗比",

          "create_time": "2017-12-05 11:38:22",

          "user_id": "1"

        }

      },

      {

        "_index": "robot",

        "_type": "brain",

        "_id": "AWAkh-NBEXHi548SCMvF",

        "_score": 0.63332754,

        "_source": {

          "question": "你",

          "answer": "我什么我，我是不是很帅",

          "create_time": "2017-12-05 10:36:13",

          "user_id": "1"

        }

      },

      {

        "_index": "robot",

        "_type": "brain",

        "_id": "AWAkiUh7EXHi548SCMvG",

        "_score": 0.4243027,

        "_source": {

          "question": "你好",

          "answer": "你好我好大家好",

          "create_time": "2017-12-05 10:37:44",

          "user_id": "1"

        }

      }

    ]

  }

}

我想问，这查询语句应该怎么写才是正确的呢，按理说question 完全命中了，都没有在前，这个权重应该怎么设置才对呢？求大神解答！
如果有java API 代码更加好！！！！