如何在NEST中使用ElasticSearch MinHash插件

Question

我想在NEST Elasticsearch.net中使用MinHash弹性搜索插件。如何在nest中使用minhash？

Answer 1

创建具有以下映射的索引：

elasticClient.CreateIndex(descriptor => descriptor
    .Index("my_index")
    .Analysis(
        analysis => analysis.Analyzers(bases => bases.Add("minhash_analyzer", new CustomAnalyzer
        {
            Tokenizer = "standard",
            Filter = new[] {"minhash"}
        })))
    .AddMapping<IndexElement>(
        mappingDescriptor =>
            mappingDescriptor
                .Properties(p => p
                    .String(s => s.Name(element => element.Message).CopyTo("minhashvalue"))
                    .Custom(new MiniHashMapping()))));

class MiniHashMapping : BinaryMapping
{
    [JsonProperty("minhash_analyzer")]
    public string Analyzer { get { return "minhash_analyzer"; } }

    public MiniHashMapping()
    {
        Type = "minhash";
        Name = "minhashvalue";
    }
}

class IndexElement
{
    public string Message { get; set; }
}

索引样本文档：

elasticClient.Index(new IndexElement
{
    Message = "Fess is Java based full text search server provided as OSS product."
}, descriptor => descriptor.Index("my_index"));

告诉elasticsearch在响应中包含字段：

var searchResponse = elasticClient.Search<IndexElement>(s => s.Query(q => q.MatchAll()).Fields("*"));

您可以从searchResponse.Hits[..].Fields或searchResponse.FieldSelections获取散列值。

希望这能有所帮助。