## 查询只输出某些字段
```
GET /user/docs/_search?_source=name,age
```
这样就会限制只显示 ``name`` 和 ``age`` 字段
```
{
"took" : 0,
"timed_out" : false,
"_shards" : {
"total" : 1,
"successful" : 1,
"skipped" : 0,
"failed" : 0
},
"hits" : {
"total" : {
"value" : 2,
"relation" : "eq"
},
"max_score" : 1.0,
"hits" : [
{
"_index" : "user",
"_type" : "docs",
"_id" : "1",
"_score" : 1.0,
"_source" : {
"name" : "王五",
"age" : 25
}
},
{
"_index" : "user",
"_type" : "docs",
"_id" : "2",
"_score" : 1.0,
"_source" : {
"name" : "王五",
"age" : 25
}
}
]
}
}
```
