在 java 中获取弹性搜索响应中的字段

Question

I am getting below response from elastic search Can anyone help me in getting only IDs in chain if there are many hits. eg chainIds = [14,162,123].... if there are 3 hits

   "hits" : [
      {
        "_shard" : "******",
        "_node" : "******",
        "_index" : "e******z",
        "_type" : "_doc",
        "_id" : "******",
        "_score" : 1.0,
        "_source" : {
          "chain" : {
            "website" : "234567.com",
            "images" : [
              {
                "url" : ""
              }
            ],
            "name" : "13452e4r5t6y7ui",
            "description" : "<p>23456</p>",
            "id" : 14
          }  
      }
]

Answer 1

You can do source filtering to get only the id field in the _source part

Adding a working example

Index Data:

{
  "chain": {
    "website": "234567.com",
    "images": [
      {
        "url": ""
      }
    ],
    "name": "13452e4r5t6y7ui",
    "description": "<p>23456</p>",
    "id": 123
  }
}
{
  "chain": {
    "website": "234567.com",
    "images": [
      {
        "url": ""
      }
    ],
    "name": "13452e4r5t6y7ui",
    "description": "<p>23456</p>",
    "id": 162
  }
}
{
  "chain": {
    "website": "234567.com",
    "images": [
      {
        "url": ""
      }
    ],
    "name": "13452e4r5t6y7ui",
    "description": "<p>23456</p>",
    "id": 14
  }
}

Search Query:

{
  "_source": "chain.id",
  "query": {
    "match_all": {}
  }
}

Search Result:

"hits": [
      {
        "_index": "66837269",
        "_type": "_doc",
        "_id": "1",
        "_score": 1.0,
        "_source": {
          "chain": {
            "id": 14
          }
        }
      },
      {
        "_index": "66837269",
        "_type": "_doc",
        "_id": "2",
        "_score": 1.0,
        "_source": {
          "chain": {
            "id": 162
          }
        }
      },
      {
        "_index": "66837269",
        "_type": "_doc",
        "_id": "3",
        "_score": 1.0,
        "_source": {
          "chain": {
            "id": 123
          }
        }
      }
    ]