如何使用elasticsearch-dsl-py创建"OR“过滤器？

Question

下面的查询是我想要使用elasticsearch-dsl-py构造的，但我不知道怎么做。

GET /my_index/_search
{
  "query": {
    "filtered": {
      "filter": {
        "bool": {
          "must": [
            {
              "term": {
                "status": "published"
              }
            },
            {
              "or": {
                "filters": [
                  {
                    "range": {
                      "start_publication": {
                        "lte": "2015-02-17T03:45:00.245012+00:00"
                      }
                    }
                  },
                  {
                    "missing": {
                      "field": "start_publication"
                    }
                  }
                ]
              }
            },
            {
              "or":{
                "filters": [
                  {
                    "range": {
                      "end_publication": {
                        "gte": "2015-02-17T03:45:00.245012+00:00"
                      }
                    }
                  },
                  {
                    "missing": {
                      "field": "end_publication"
                    }
                  }
                ]
              }
            }
          ]
        }
      }
    }
  }
}

使用elasticsearch-dsl-py，这是我能得到的最接近的结果，但它并不相同。

    client = Elasticsearch()
    now = timezone.now()

    s = Search(using=client,
               index="my_index"
        ).filter(
            "term", status=PUBLISHED
        ).filter(
            F("range", start_publication={"lte": now}, ) |
            F("missing", field="start_publication")
        ).filter(
            F("range", end_publication={"gte": now}, ) |
            F("missing", field="end_publication")
        )
    response = s.execute()

Answer 1

解决方案：

s = Search(using=client,
           index="my_index"
    ).filter(
        "term", status=PUBLISHED
    ).filter(
        "or", [F("range", start_publication={"lte": now}, ),
               F("missing", field="start_publication")]
    ).filter(
        "or", [F("range", end_publication={"gte": now}, ),
               F("missing", field="end_publication")]
    )

它变成了：

{  
   "query":{  
      "filtered":{  
         "filter":{  
            "bool":{  
               "must":[  
                  {  
                     "term":{  
                        "status":"published"
                     }
                  },
                  {  
                     "or":{  
                        "filters":[  
                           {  
                              "range":{  
                                 "start_publication":{  
                                    "lte":"2015-02-17T03:45:00.245012+00:00"
                                 }
                              }
                           },
                           {  
                              "missing":{  
                                 "field":"start_publication"
                              }
                           }
                        ]
                     }
                  },
                  {  
                     "or":{  
                        "filters":[  
                           {  
                              "range":{  
                                 "end_publication":{  
                                    "gte":"2015-02-17T03:45:00.245012+00:00"
                                 }
                              }
                           },
                           {  
                              "missing":{  
                                 "field":"end_publication"
                              }
                           }
                        ]
                     }
                  }
               ]
            }
         },
         "query":{  
            "match_all":{  

            }
         }
      }
   }
}

希望将来能将其包含在elasticsearch-dsl-py文档中。

Answer 2

使用Elasticsearch 2.x (和elasticsearch-dsl > 2.x)，你不能再像@thlow1的评论中那样应用过滤器了。相反，你必须通过组合Q来构造你的过滤器：

search = Search(using=esclient, index="myIndex")
firstFilter = Q("match", color='blue') & Q("match", status='published')
secondFilter = Q("match", color='yellow') & Q("match", author='John Doe')
combinedFilter = firstFilter | secondFilter
search = search.query('bool', filter=[combinedFilter])

如elasticsearch-dsl documentation中所述，search.query('bool', filter=[combinedQ])应用Q标准作为过滤器。