我有一个带有UserID
字段的类,该字段包含一个邮件地址,并且我希望能够在该字段上进行搜索,以找到完全匹配的内容,或包含某些排除条件的邮件地址的一部分。
例如,如果UserID
包含“john.doe@foo.com”,我希望能够搜索“john.doe@foo.com”,“john”和“doe”,但可以搜索“foo”和“com” ”应从索引中排除。
我尝试创建一个自定义分析器,该分析器使用带有终止词列表的停止过滤器,然后将多索引应用于该属性,如以下示例所示:
using Nest;
using System;
using System.Collections.Generic;
[ElasticType]
public class ElasticUser {
[ElasticProperty(Index = FieldIndexOption.NotAnalyzed)]
public string UserID { get; set; }
}
class Program {
static void Main(string[] args) {
const string IndexName = "test_index";
var settings = new ConnectionSettings(uri: new Uri("http://localhost:9200/"), defaultIndex: IndexName);
var client = new ElasticClient(settings);
// delete the index for the test
var deleteIndexResp = client.DeleteIndex(IndexName);
// create the custom filter and analyzer
var user_id_stop_filter = new StopTokenFilter {
Stopwords = new[] { "foo", "bar", "com" }
};
var user_id_analyzer = new CustomAnalyzer {
Filter = new List<string> {
"user_id_stop_filter"
},
Tokenizer = "letter"
};
// create the index with the custom filter and analyzer
var createIndexResp = client.CreateIndex(IndexName, index => index
.Analysis(analysis => analysis
.TokenFilters(t => t
.Add("user_id_stop_filter", user_id_stop_filter))
.Analyzers(a => a
.Add("user_id_analyzer", user_id_analyzer))));
// add a mapping for the "ElasticUser" type
var putMapResp = client.Map<ElasticUser>(
m => m.MapFromAttributes()
.Properties(properties => properties
.MultiField(multi => multi
.Name(p => p.UserID)
.Fields(fields => fields
.String(s => s
.Name(p => p.UserID)
.Index(FieldIndexOption.NotAnalyzed)
)
.String(s => s
.Name(p => p.UserID.Suffix("searchable"))
.Analyzer("user_id_analyzer")
)
)
)
));
// add a couple of entries
client.Index(new ElasticUser {
UserID = "some.one@foo.com"
});
client.Index(new ElasticUser {
UserID = "another.one@bar.com"
});
}
}
但是,这似乎不起作用,因为我只能搜索完全匹配的内容,但是电子邮件地址未标记化为非单词拆分。
如何使该多索引按说明工作?
当我尝试运行此查询时,没有得到任何结果:
GET /test_index/elasticuser/_search
{
"query": {
"query_string": {
"query": "one"
}
}
}
最佳答案
实现所需目标的最简单方法是在simple
字段上简单地使用 searchable
analyzer:
...
.String(s => s
.Name(p => p.UserID.Suffix("searchable"))
.Analyzer("simple") <---- change this
)
...
该电子邮件将被标记为任何非字母字符,并且您将能够搜索
john
和doe
。更新
如果您想保留排除列表,则绝对可以这样做。您可以保留现有的分析器,但需要使用
lowercase
tokenizer(即与simple
分析器使用的相同)代替letter
。 var user_id_analyzer = new CustomAnalyzer {
Filter = new List<string> {
"user_id_stop_filter"
},
Tokenizer = "lowercase" <--- change this
};
更新2
在纯JSON中,这就是我所拥有的
curl -XPUT localhost:9200/users -d '{
"settings": {
"analysis": {
"analyzer": {
"email_analyzer": {
"type": "custom",
"tokenizer": "lowercase",
"filter": [
"my_stop"
]
}
},
"filter": {
"my_stop": {
"type": "stop",
"stopwords": [
"foo",
"bar",
"com"
]
}
}
}
},
"mappings": {
"user": {
"properties": {
"email": {
"type": "string",
"fields": {
"raw": {
"type": "string",
"index": "not_analyzed"
},
"parts": {
"type": "string",
"analyzer": "email_analyzer"
}
}
}
}
}
}
}'
然后,当我分析
some.one@foo.com
时,这就是我得到的$ curl -XGET 'localhost:9200/users/_analyze?field=email.parts&pretty' -d 'some.one@foo.com'
{
"tokens" : [ {
"token" : "some",
"start_offset" : 0,
"end_offset" : 4,
"type" : "word",
"position" : 1
}, {
"token" : "one",
"start_offset" : 5,
"end_offset" : 8,
"type" : "word",
"position" : 2
} ]
}
关于c# - 使用Nest创建自定义分析器(用于电子邮件地址),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/34925297/