elasticsearch - Nest筛选功能分数

Question

我正在尝试使用DSL语法构建以下查询:

    GET /_search
    {
      "query": {
        "function_score": {
          "filter": { 
            "term": { "city": "Barcelona" }
          },
          "functions": [ 
            {
              "filter": { "term": { "features": "wifi" }}, 
              "weight": 1
            },
            {
              "filter": { "term": { "features": "garden" }}, 
              "weight": 1
            },
            {
              "filter": { "term": { "features": "pool" }}, 
              "weight": 2 
            }
          ],
          "score_mode": "sum", 
        }
      }
    }

但是，使用NEST客户端时，在function_score中似乎没有filter选项。我可以确认查询是 flex 的。

Answer 1

我不确定要定位的是哪个版本的Elasticsearch，但是自Elasticsearch 2.0 when queries and filters were merged以来，filter查询上没有function_score属性。 NEST公开了Elasticsearch API中可用的功能，因此该属性在NEST 1.x中可用，但在任何更高版本中均不可用。

Filters on individual functions exist

var response = client.Search<object>(s => s
    .Query(q => q
        .FunctionScore(fs => fs
            .Functions(fu => fu
                .Weight(w => w
                    .Weight(1)
                    .Filter(wf => wf
                        .Term("features", "pool")
                    )
                )
            )
        )
    )
);