ElasticSearch按字段将文档聚合到数组中

JeyJ 发表于 Java

杰伊：

我正在尝试将以下逻辑作为Java中的查询写到elasticsearch：

ES包含以下文档：

{"request" : 1, "store":"ebay", "status" : "retrieved" , "lastdate": "2012/12/20 17:00", "retrieved_by" : "John"}
{"request" : 1, "store":"ebay", "status" : "stored" , "lastdate": "2012/12/20 18:00", "stored_by" : "Alex"}
{"request" : 1, "store":"ebay", "status" : "bought" , "lastdate": "2012/12/20 19:00", "bought_by" : "Arik"}
{"request" : 2, "store":"aliexpress", "status" : "retrieved" , "lastdate": "2012/12/20 17:00"}
{"request" : 2, "store":"aliexpress","status" : "stored" , "lastdate": "2012/12/20 18:00"}
{"request" : 2, "store":"aliexpress","status" : "bought" , "lastdate": "2012/12/20 19:00"}

我正在尝试编写一个查询，该查询将获取商店名称作为输入，并返回通过其request_id汇总到数组中的该商店的请求。

换句话说，我正在尝试：

1.按条款对特定字段（“商店”）进行过滤。

2.将基于特定字段（“请求”）的结果汇总到一个数组中

例如，输入“ ebay”：

{
"1" : [
{"request" : 1, "store":"ebay", "status" : "retrieved" , "lastdate": "2012/12/20 17:00", "retrieved_by" : "John"}
{"request" : 1, "store":"ebay", "status" : "stored" , "lastdate": "2012/12/20 18:00", "stored_by" : "Alex"}
{"request" : 1, "store":"ebay", "status" : "bought" , "lastdate": "2012/12/20 19:00", "bought_by" : "Arik"}
],

".." : [...]

}

它并不重要，结果中的密钥将是请求（我将购买任何密钥）。重要的部分是我将请求字段中的所有记录聚合到一个数组中，并按lastdate在数组中对它们进行排序。

我的最终目标是使用java QueryBuilder创建此查询。因此，我首先尝试使用弹性本机查询语言，以便了解要使用的QueryBuilder。

乔：

设置基本映射：

PUT stores
{
  "mappings": {
    "properties": {
      "lastdate": {
        "type": "date",
        "format": "yyyy/MM/dd HH:mm"
      }
    }
  }
}

同步一些文档：

POST _bulk
{"index":{"_index":"stores","_type":"_doc"}}
{"request":1,"store":"ebay","status":"retrieved","lastdate":"2012/12/20 17:00","retrieved_by":"John"}
{"index":{"_index":"stores","_type":"_doc"}}
{"request":1,"store":"ebay","status":"stored","lastdate":"2012/12/20 18:00","stored_by":"Alex"}
{"index":{"_index":"stores","_type":"_doc"}}
{"request":1,"store":"ebay","status":"bought","lastdate":"2012/12/20 19:00","bought_by":"Arik"}
{"index":{"_index":"stores","_type":"_doc"}}
{"request":2,"store":"aliexpress","status":"retrieved","lastdate":"2012/12/20 17:00"}
{"index":{"_index":"stores","_type":"_doc"}}
{"request":2,"store":"aliexpress","status":"stored","lastdate":"2012/12/20 18:00"}
{"index":{"_index":"stores","_type":"_doc"}}
{"request":2,"store":"aliexpress","status":"bought","lastdate":"2012/12/20 19:00"}

过滤查询，然后按request字段进行汇总并使用sorted top_hits：

GET stores/_search
{
  "size": 0, 
  "query": {
    "term": {
      "store": {
        "value": "ebay"
      }
    }
  },
  "aggs": {
    "by_req": {
      "terms": {
        "field": "request"
      },
      "aggs": {
        "hits": {
          "top_hits": {
            "sort": [
              {
                "lastdate": {
                  "order": "desc"
                }
              }
            ]
          }
        }
      }
    }
  }
}

将其转换为Java DSL并不难。

本文收集自互联网，转载请注明来源。

如有侵权，请联系 [email protected] 删除。