你应该是从doc里读取的数据，如果从_source里读取就没这个问题。 不太清楚doc_values为什么对float类型会有精度损失，不过测试了一下，如果用double，则doc value里读取出来的精度和source里的一样，没有这个问题。[code]PUT testme
{
  "settings": {},
  "mappings": {
    "doc": {
      "properties": {
        "id": {
          "type": "double"
        }
      }
    }
  }
}

POST testme/doc
{
  "id": 1.01
}

POST testme/_search
{
  "docvalue_fields": [
    "id"
  ]
}

{
  "took": 0,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": 1,
    "max_score": 1,
    "hits":
        }
      }
    ]
  }
}

 
 
或者觉得doulbe精度过高，浪费存储空间的话，也可以用scaled_float，看起来也是OK的[code]PUT testme
{
"settings": {},
"mappings": {
"doc": {
"properties": {
"id": {
"type": "scaled_float",
"scaling_factor": 100
}
}
}
}
}

POST testme/doc
{
"id": 1.01
}

POST testme/_search
{
"docvalue_fields": [
"id"
]
}

{
"took": 0,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"skipped": 0,
"failed": 0
},
"hits": {
"total": 1,
"max_score": 1,
"hits":
}
}
]
}
}