javascript - 从 ElasticSearch 获取 json 的子集

Question

我想要从 ElasticSearch 服务器获取 json 响应的子集。我是 ElasticSearch 和 JavaScript 的新手。请看一看。 json 文件是示例文件 here来自 ElasticSearch 文档。这是一个示例:

{
  "took" : 1,
  "timed_out" : false,
  "_shards" : {
    "total" : 5,
    "successful" : 5,
    "failed" : 0
  },
  "hits" : {
    "total" : 1000,
    "max_score" : 1.0,
    "hits" : [ {
      "_index" : "bank",
      "_type" : "account",
      "_id" : "4",
      "_score" : 1.0,
      "_source":{"account_number":4,"balance":27658,"firstname":"Rodriquez","lastname":"Flores","age":31,"gender":"F","address":"986 Wyckoff Avenue","employer":"Tourmania","email":"rodriquezflores@tourmania.com","city":"Eastvale","state":"HI"}
    }, {
      "_index" : "bank",
      "_type" : "account",
      "_id" : "9",
      "_score" : 1.0,
      "_source":{"account_number":9,"balance":24776,"firstname":"Opal","lastname":"Meadows","age":39,"gender":"M","address":"963 Neptune Avenue","employer":"Cedward","email":"opalmeadows@cedward.com","city":"Olney","state":"OH"}
    }
................................
]
  }
}

如何提取 account_number、余额和姓氏的数组，例如 [{"account_number":9,"balance":24776,"lastname":"Meadows"},{"account_number":4,"余额":27658,"姓氏":"弗洛雷斯"},……].

这是我使用的代码:

var deferred = $q.defer();          
          $http.get("http://localhost:9200/bank/_search?q=*").success(function(data){          

          var country=data.hits.hists.map( function (count) {
                return {
                 account_number:  count._source.account_number,
                 balance:  count._source.balance,
                 lastname: count._source.lastname                    
                  };
              });    

          deferred.resolve(country);
          });

          return deferred.promise; 

我从类似的代码中获得了灵感one用于 REST 调用。看来我得到的数据是未定义。 ES 端需要配置吗？

Answer 1

您可以使用 source filtering 指示 ES 仅返回这些字段:

$http.get("http://localhost:9200/bank/_search?_source=account_number,balance,lastname&q=*").success(function(data){          

这样您就不必自己过滤字段。

那么下一行有一个拼写错误:hists 应该读取 hits

var country=data.hits.hits.map( function (count) {

请尝试一下。