映射和索引弹性NEST中的路径层次结构,用于在目录路径中进行搜索 [英] Mapping and indexing Path hierarchy in Elastic NEST to search with in directory paths
问题描述
我需要在特定目录中搜索文件和文件夹。为了做到这一点,弹性要求我们创建分析器并将tokenizer设置为 path_hierarchy
I need to search for files and folder with in specific directories. In order to do that, elastic asks us to create the analyzer and set the tokenizer to path_hierarchy
PUT /fs
{
"settings": {
"analysis": {
"analyzer": {
"paths": {
"tokenizer": "path_hierarchy"
}
}
}
}
}
然后,使用两个属性创建映射:name(保存文件的名称)和path(存储目录路径):
Then, create the mapping as illustrated below with two properties: name (holding the name of the file) and path (to store the directory path):
PUT /fs/_mapping/file
{
"properties": {
"name": {
"type": "string",
"index": "not_analyzed"
},
"path": {
"type": "string",
"index": "not_analyzed",
"fields": {
"tree": {
"type": "string",
"analyzer": "paths"
}
}
}
}
}
这需要我们索引文件所在目录的路径:
This requires us to index the path of the directory where the file lives:
PUT /fs/file/1
{
"name": "README.txt",
"path": "/clinton/projects/elasticsearch",
}
问题:
如何在NEST弹性中创建此映射使用c#?
The Question: How can i create this mapping in NEST Elastic using c#?
推荐答案
分析器是通过声明一个自定义分析器创建的,然后设置它tokenizer到 path_tokenizer :
The analyzer is created by declaring a custom analyzer, and then setting its tokenizer to "path_tokenizer":
//name of the tokenizer "path_tokenizer"
string pathTokenizerName = "path_tokenizer";
//the name of the analyzer
string pathAnalyzerName = "path";
PathHierarchyTokenizer pathTokenizer = new PathHierarchyTokenizer();
AnalyzerBase pathAnalyzer = new CustomAnalyzer
{
Tokenizer = pathTokenizerName,
};
第二步是使用所需的分析器和映射创建索引,在属性LogicalPath 将保留系统中目录的位置
The second step is creating the index with required analyzer and mapping, in the code below the property "LogicalPath" will keep the locations of directories in the system"
//Create the index,
elastic.CreateIndex(_indexName, i => i
.NumberOfShards(1).NumberOfReplicas(0)
// Adding the path analyzers to the index.
.Analysis(an => an
.Tokenizers(tokenizers => tokenizers
.Add(pathTokenizerName, pathTokenizer)
)
.Analyzers(analyzer => analyzer
.Add(pathAnalyzerName, pathAnalyzer)
)
)
// Add the mappings
.AddMapping<Document>(t => t
.MapFromAttributes()
.Properties(props => props
//associating path tokenizer with required property "Logical Path"
.String(myPathProperty => myPathProperty
.Name(_t => _t.LogicalPath)
.IndexAnalyzer(pathAnalyzerName)
)
)
));
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