elasticsearch - 为什么区分大小写在elasticSearch中不起作用

Question

我想在Elasticsearch query_string中使用区分大小写的代码

query_string: {
      default_field : 'message',
      query: 'info',
    }

如果输入 info，则输出将显示 info和 INFO。

如何在Elasticsearch query_string中使用区分大小写的代码？

Answer 1

不建议使用official ES doc中提到的用于搜索栏或常规全文本搜索的查询字符串。从同一链接:

Because it returns an error for any invalid syntax, we don’t recommend using the query_string query for search boxes.

If you don’t need to support a query syntax, consider using the match query. If you need the features of query syntax, use the simple_query_string query, which is less strict.

我建议使用上面建议的 match查询，对它进行分析并在文本字段上提供不区分大小写的搜索。因此，在您的示例中，您可以如下定义映射:

"mappings": {
        "properties": {
            "message": {
                "type": "text" --> note `text` type which uses `standard` analyzer
            }
        }
    }

索引样本数据(注意区分大小写的文档)

{
    "message": "foo"
}
{
    "message": "Foo"
}
{
    "message": "FOO"
}

然后使用下面的查询来查询数据:

{
    "query": {
        "bool": {
            "must": [
                {
                    "match": {
                        "message": "foo" -->you can change it to `Foo` and it will still give all results.
                    }
                }
            ]
        }
    }
}

并给出所有结果，如下所示:

"hits": [
            {
                "_index": "querystring",
                "_type": "_doc",
                "_id": "1",
                "_score": 0.13353139,
                "_source": {
                    "message": "FOO"
                }
            },
            {
                "_index": "querystring",
                "_type": "_doc",
                "_id": "2",
                "_score": 0.13353139,
                "_source": {
                    "message": "Foo"
                }
            },
            {
                "_index": "querystring",
                "_type": "_doc",
                "_id": "3",
                "_score": 0.13353139,
                "_source": {
                    "message": "foo"
                }
            }
        ]