Question

是否可以仅过滤弹性搜索中的特定字段而不是完整文档。下面我提到了示例数据，请检查。

Ex：我的数据。

    {
  "took": 65,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": 1,
    "max_score": 4.89784,
    "hits": [
      {
        "_index": "mytest",
        "_type": "bank",
        "_id": "1",
        "_score": 4.89784,
        "_source": {
          "account_number": 1,
          "balance": 39225,
          "firstname": "Amber",
          "lastname": "Duke",
          "age": 32,
          "gender": "M",
          "address": "880 Holmes Lane",
          "employer": "Pyrami",
          "email": "amberduke@pyrami.com",
          "city": "Brogan",
          "state": "IL"
        }
      }
    ]
  }

预期结果。

{
   [
{
"account_number": 1,
"balance": 39225,
}
   ]
}

我的其余API

http://localhost:9200/mytest/bank/_search?q=firstname:Virginia%20AND%20age:39

输出：

{"took":2,"timed_out":false,"_shards":{"total":5,"successful":5,"skipped":0,"failed":0},"hits":{"total":1,"max_score":5.882802,"hits":[{"_index":"mytest","_type":"bank","_id":"25","_score":5.882802,"_source":{"account_number":25,"balance":40540,"firstname":"Virginia","lastname":"Ayala","age":39,"gender":"F","address":"171 Putnam Avenue","employer":"Filodyne","email":"virginiaayala@filodyne.com","city":"Nicholson","state":"PA"}}]}}

编辑1

http://localhost:9200/mytest/bank/_search?_source=account_number&q=account_number:25

输出：

{"took":7,"timed_out":false,"_shards":{"total":5,"successful":5,"skipped":0,"failed":0},"hits":{"total":1,"max_score":1.0,"hits":[{"_index":"mytest","_type":"bank","_id":"25","_score":1.0,"_source":{"account_number":25}}]}}

Answer 1

您是否需要从文档中检索一组特定字段？您可以像这样使用_source参数：

http://localhost:9200/mytest/bank/_search?q=firstname:Virginia%20AND%20age:39&_source=account_number,balance

<强>更新：

我将使用REST API。创建索引：

curl -XPUT 'localhost:9200/test'
{"acknowledged":true,"shards_acknowledged":true,"index":"test"}

将文档添加到索引：

curl -XPUT 'localhost:9200/test/test/1' -H'Content-Type: application/json'  -d '{"one": "10", "two": "20", "three": "30", "four": "40"}'
{"_index":"test","_type":"test","_id":"1","_version":1,"result":"created","_shards":{"total":2,"successful":1,"failed":0},"_seq_no":0,"_primary_term":1}

获取文档中的所有字段：

curl -GET 'localhost:9200/test/test/1'
{"_index":"test","_type":"test","_id":"1","_version":1,"found":true,"_source":{"one": "10", "two": "20", "three": "30", "four": "40"}}

获取文档中的选定字段：

curl -GET 'localhost:9200/test/test/1?_source=one,four'
{"_index":"test","_type":"test","_id":"1","_version":1,"found":true,"_source":{"four":"40","one":"10"}}

如果您仍然遇到问题，则需要像我一样发布完整示例。

更新2：

使用搜索请求获取所有字段：

curl -XGET  -H'Content-Type: application/json' localhost:9200/test/test/_search -d'{"query":{"match_all":{}}}'
{"took":180,"timed_out":false,"_shards":{"total":5,"successful":5,"skipped":0,"failed":0},"hits":{"total":1,"max_score":1.0,"hits":[{"_index":"test","_type":"test","_id":"1","_score":1.0,"_source":{"one": "10", "two": "20", "three": "30", "four": "40"}}]}}

使用搜索请求获取所选字段：

curl -XGET  -H'Content-Type: application/json' 'localhost:9200/test/test/_search?_source=one,four' -d'{"query":{"match_all":{}}}'
{"took":6,"timed_out":false,"_shards":{"total":5,"successful":5,"skipped":0,"failed":0},"hits":{"total":1,"max_score":1.0,"hits":[{"_index":"test","_type":"test","_id":"1","_score":1.0,"_source":{"four":"40","one":"10"}}]}}

更新3：

curl -XGET  -H'Content-Type: application/json' 'localhost:9200/test/test/_search?_source=one&q=one:10'
    {"took":11,"timed_out":false,"_shards":{"total":5,"successful":5,"skipped":0,"failed":0},"hits":{"total":1,"max_score":0.2876821,"hits":[{"_index":"test","_type":"test","_id":"1","_score":0.2876821,"_source":{"one":"10"}}]}}

如何从弹性搜索中过滤特定字段

1 个答案: