filtering facets in elasticsearch

问题

I have a query like below,

    query = {

        "query": {"query_string": {"query": "%s" % q}},
        "filter":{"ids":{"values":list(ids)}},
        "facets": {"destination": {
            "terms": {"field": "destination.en"}},
        "hotel_class":{
            "terms":{"field":"hotel_class"}},
        "hotel_type":{
            "terms":{"field": "hotel_type"}},
        }}

But my facets are not filtered due to my ids filter. I get all the facets, but I want them filtered by my ids filter above. Do you have any ideas ?

回答1:

Although what you do works, a cleaner solution would be to have a filtered query. http://www.elasticsearch.org/guide/reference/query-dsl/filtered-query/

Which allows for your original query + some arbitrary filter (which in turn can be a complex boolean/ nested filter, etc.)

  {
    query: {
        "filtered" : {
           "query": {"query_string": {"query": "%s" % q}},
           "filter":{"ids":{"values":list(ids)}},
        }
    },
    "facets": {
        "destination": {
            "terms": {"field": "destination.en"}
        },
        "hotel_class": {
            "terms": {"field": "hotel_class"}
        },
        "hotel_type": {
            "terms": {"field": "hotel_type"}
        }
    }
 }

The rationale is the following:

any query is applied BEFORE faceting.
any filter is applied AFTER faceting.

So if you want your facets to be filtered by some filter, you have to include said filter in the QUERY.

回答2:

facet_filter fixed my problem,

like below,

{
  "query": {
    "query_string": {
      "query": "%s" %q
    }
  },
  "filter": {
    "ids": {
      "values": list(ids)
    }
  },
  "facets": {
    "destination": {
      "terms": {
        "field": "destination.en"
      },
      "facet_filter": {
        "ids": {
          "values": list(ids)
        }
      }
    },
    "hotel_class": {
      "terms": {
        "field": "hotel_class"
      },
      "facet_filter": {
        "ids": {
          "values": list(ids)
        }
      }
    },
    "hotel_type": {
      "terms": {
        "field": "hotel_type"
      },
      "facet_filter": {
        "ids": {
          "values": list(ids)
        }
      }
    },
  }
}

来源：https://stackoverflow.com/questions/16231727/filtering-facets-in-elasticsearch

标签

ElasticSearch

facets