Elasticsearch 9.x + Elastic.Clients.Elasticsearch

Elasticsearch server

curl -X GET "localhost:9200/"
{
  "name" : "debian",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "xtNEuvEeRVmtK9iCT2WWyQ",
  "version" : {
    "number" : "9.1.4",
    "build_flavor" : "default",
    "build_type" : "deb",
    "build_hash" : "0b7fe68d2e369469ff9e9f344ab6df64ab9c5293",
    "build_date" : "2025-09-16T22:05:19.073893347Z",
    "build_snapshot" : false,
    "lucene_version" : "10.2.2",
    "minimum_wire_compatibility_version" : "8.19.0",
    "minimum_index_compatibility_version" : "8.0.0"
  },
  "tagline" : "You Know, for Search"
}

.Net Client

Elastic.Clients.Elasticsearch 9.18

#region 01-创建索引（带分词器配置）
    /// <summary>
    /// 01-创建索引（带分词器配置）
    /// </summary>
    /// <returns></returns>
    /// <exception cref="Exception"></exception>
    public async Task CreateIndexAsync()
    {
        var exists = await _client.Indices.ExistsAsync(indexName);
        if (exists.Exists) return;

        var response = await _client.Indices.CreateAsync(indexName, c => c
            .Settings(s => s.NumberOfShards(1).NumberOfReplicas(0))
            .Mappings(m => m
                .Properties<Book>(p => p
                    .Keyword(k => k.id)
                    .Text(t => t.title, f => f.Analyzer("ik_max_word"))     // 中文分词（需安装IK插件）
                    .Text(t => t.author, f => f.Analyzer("ik_smart"))       // 中文分词（需安装IK插件）
                    .Keyword(t=>t.category)
                    .FloatNumber(n => n.price)
                    .Date(d => d.published_date)
                    .Keyword(k => k.tags)      // 标签不分词，用于精确查询
                )
            )
        );
        if (!response.IsValidResponse)
            throw new Exception($"创建索引失败: {response.DebugInformation}");
    }
    #endregion

https://www.cnblogs.com/yaopengfei/p/18984246

2.create a mapping

curl -XPOST http://localhost:9200/index/_mapping -H 'Content-Type:application/json' -d'
{
        "properties": {
            "content": {
                "type": "text",
                "analyzer": "ik_max_word",
                "search_analyzer": "ik_smart"
            }
        }

}'

View the mapping of an index

GET /my-index-000001/_mapping

{
  "my-index-000001" : {
    "mappings" : {
      "properties" : {
        "age" : {
          "type" : "integer"
        },
        "email" : {
          "type" : "keyword"
        },
        "employee-id" : {
          "type" : "keyword",
          "index" : false
        },
        "name" : {
          "type" : "text"
        }
      }
    }
  }
}

https://www.elastic.co/docs/manage-data/data-store/mapping/explicit-mapping

guide：

https://www.elastic.co/docs/reference/elasticsearch/clients/dotnet/examples

https://www.elastic.co/docs/reference/elasticsearch/clients/dotnet/recommendations

sample

https://github.com/elastic/elasticsearch-net/blob/main/examples/aot/Program.cs

mapping sample

https://www.elastic.co/docs/reference/elasticsearch/clients/dotnet/mappings