在 Elastic NEST 中映射和索引路径层次结构以在目录路径中进行搜索

Question

我需要在特定目录中搜​​索文件和文件夹。为此，elastic 要求我们创建分析器并将分词器设置为 path_hierarchy

PUT /fs
{
    "settings": {
        "analysis": {
            "analyzer": {
                "paths": {
                    "tokenizer": "path_hierarchy"
                }
            }
        }
    }
}

然后，使用两个属性创建如下图所示的映射：名称（保存文件的名称）和路径（用于存储目录路径）：

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：

PUT /fs/file/1
{
  "name": "README.txt",
  "path": "/clinton/projects/elasticsearch",
}

The Question: How can i create this mapping in NEST Elastic using c#?

Answer 1

分析器是通过声明自定义分析器创建的，然后将其分词器设置为“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，在下面的代码中 属性 "LogicalPath" 将保留系统中目录的位置

                //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)
                                    )
                            )
                        ));