elasticsearch - Elasticsearch:在span_query中使用boost

Question

我想在span_or查询中使用boost，但出现错误。

这是我的elasticsearch代码，错误返回

GET /addr/_search
{
  "query":{    
    "span_near": {
        "clauses" : [
            { 
              "span_or": { 
                "clauses" : [
                  {
                    "span_term": {
                      "poi": {
                        "value": "long",
                        "boost" : 2.0
                      }
                    }
                  }, 
                  { 
                    "span_term": {
                      "poi": {
                        "value": "mei"
                       }
                    }
                  }
                ]
              }
            },
            { "span_term" : { "poi" : "da" } }
        ],
        "slop" : 1,
        "in_order" : true
    }
  },
  "sort": [{"freq": {"order": "desc"}}]
}

root_cause": [
      {
        "type": "parsing_exception",
        "reason": "span_or [clauses] as a nested span clause can't have non-default boost value [2.0]",
        "line": 15,
        "col": 19
      }
    ]

因此可以在span_or或span_near查询中使用boost吗？就像在bool查询中一样

Answer 1

boost参数仅用于外部范围查询...
如此处所述:
https://www.elastic.co/guide/en/elasticsearch/reference/current/span-queries.html

仅允许在外部跨度查询上设置提升。复合跨度查询(例如span_near)仅使用内部跨度查询的匹配跨度列表来查找自己的跨度，然后将其用于产生分数。分数永远不会在内部跨度查询中计算出来，这就是不允许提升的原因:它们只会影响分数的计算方式，而不会影响跨度。

GET /addr/_search
{
  "query":{    
    "span_near": {
        "boost" : 2.0 <-------------------- here //untested
        "clauses" : [
            { 
              "span_or": { 
                "boost" : 2.0 <-------------------- here //untested
                "clauses" : [
                  {
                    "span_term": {
                      "poi": {
                        "value": "long",
                        "boost" : 2.0 <-------------- not allowed
                      }
                    }
                  }, 
                  { 
                    "span_term": {
                      "poi": {
                        "value": "mei"
                       }
                    }
                  }
                ]
              }
            },
            { "span_term" : { "poi" : "da" } }
        ],
        "slop" : 1,
        "in_order" : true
    }
  },
  "sort": [{"freq": {"order": "desc"}}]
}