search - Elasticsearch 小写过滤搜索

Question

我正在尝试搜索我的数据库并能够使用大写/小写过滤条件，但我注意到当query 应用分析器时，我不知道如何应用过滤搜索中的小写分析器。这是查询:

{
    "query": {
        "filtered": {
            "filter": {
                "bool": {
                    "should": [
                        {
                            "term": {
                                "language": "mandarin" // Returns a doc
                            }
                        },
                        {
                            "term": {
                                "language": "Italian" // Does NOT return a doc, but will if lowercased
                            }
                        }
                    ]
                }
            }
        }
    }
}

我有一个 languages 类型，我使用了小写:

"analyzer": {
    "lower_keyword": {
        "type": "custom",
        "tokenizer": "keyword",
        "filter": "lowercase"
    }
}

和相应的映射:

"mappings": {
    "languages": {
        "_id": {
            "path": "languageID"
        },
        "properties": {
            "languageID": {
                "type": "integer"
            },
            "language": {
                "type": "string",
                "analyzer": "lower_keyword"
            },
            "native": {
                "type": "string",
                "analyzer": "keyword"
            },
            "meta": {
                "type": "nested"
            },
            "language_suggest": {
                "type": "completion"
            }
        }
    }
}

Answer 1

问题是您有一个在索引期间分析过的字段以将其小写，但您正在为未分析的查询使用术语过滤器:

Term Filter

Filters documents that have fields that contain a term (not analyzed). Similar to term query, except that it acts as a filter.

http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/query-dsl-term-filter.html

我会尝试使用查询过滤器:

Query Filter

Wraps any query to be used as a filter. Can be placed within queries that accept a filter.

示例:

{
    "constantScore" : {
        "filter" : {
            "query" : {
                "query_string" : {
                    "query" : "this AND that OR thus"
                }
            }
        }
    } }

http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/query-dsl-query-filter.html#query-dsl-query-filter