在Elasticsearch中提升字段前綴匹配

Question

有沒有辦法在字段后面的術語匹配中提高前綴字段匹配的分數？ 大多數Elasticsearch / Lucene文檔似乎都關注術語而不是字段。

例如，當搜索femal* ，我希望Female等級高於Microscopic examination of specimen from female 。 有沒有辦法在查詢方面這樣做，或者我需要做一些事情，比如創建一個由第一個單詞組成的單獨字段？

Answer 1

要做到這一點，你可以使用一個bool -query和一個should在span_first -query中加權的查詢，而后者又有一個span_multi

這是一個可以玩的可運行的例子： https ： //www.found.no/play/gist/8107157

#!/bin/bash

export ELASTICSEARCH_ENDPOINT="http://localhost:9200"

# Index documents
curl -XPOST "$ELASTICSEARCH_ENDPOINT/_bulk?refresh=true" -d '
{"index":{"_index":"play","_type":"type"}}
{"title":"Female"}
{"index":{"_index":"play","_type":"type"}}
{"title":"Female specimen"}
{"index":{"_index":"play","_type":"type"}}
{"title":"Microscopic examination of specimen from female"}
'

# Do searches

# This will match all documents.
curl -XPOST "$ELASTICSEARCH_ENDPOINT/_search?pretty" -d '
{
    "query": {
        "prefix": {
            "title": {
                "prefix": "femal"
            }
        }
    }
}
'

# This matches only the two first documents.
curl -XPOST "$ELASTICSEARCH_ENDPOINT/_search?pretty" -d '
{
    "query": {
        "span_first": {
            "end": 1,
            "match": {
                "span_multi": {
                    "match": {
                        "prefix": {
                            "title": {
                                "prefix": "femal"
                            }
                        }
                    }
                }
            }
        }
    }
}
'

# This matches all, but prefers the one's with a prefix match.
# It's sufficient that either of these match, but prefer that both matches.
curl -XPOST "$ELASTICSEARCH_ENDPOINT/_search?pretty" -d '
{
    "query": {
        "bool": {
            "should": [
                {
                    "span_first": {
                        "end": 1,
                        "match": {
                            "span_multi": {
                                "match": {
                                    "prefix": {
                                        "title": {
                                            "prefix": "femal"
                                        }
                                    }
                                }
                            }
                        }
                    }
                },
                {
                    "match": {
                        "title": {
                            "query": "femal"
                        }
                    }
                }
            ]
        }
    }
}
'