C#弹性搜索-需要向弹性索引对象添加新参数，并将其默认值设置为所有其他对象

using Nest;
using System.Collections.Generic;

public class Document
{
    public string Id { get; set; }
    public string Title { get; set; }
    public string Content { get; set; }
    public string NewParam { get; set; }
}

public class ElasticsearchHelper
{
    private readonly ElasticClient _client;

    public ElasticsearchHelper(Uri node)
    {
        var settings = new ConnectionSettings(node);
        _client = new ElasticClient(settings);
    }

    public void AddNewParameterToIndex(string indexName)
    {
        var putSettingsResponse = _client.Indices.PutSettings(indexName, p => p
            .Map<Document>(m => m
                .Properties(props => props
                    .Text(t => t.Name(d => d.Title))
                    .Text(t => t.Name(d => d.Content))
                    .Keyword(k => k.Name(d => d.NewParam).IgnoreAbove(256))
                )
            )
        );

        if (putSettingsResponse.IsValid)
        {
            Console.WriteLine("New parameter added successfully.");
        }
        else
        {
            Console.WriteLine($"Failed to add new parameter: {putSettingsResponse.OriginalException.Message}");
        }
    }

    public void AddDocument(Document doc)
    {
        var indexResponse = _client.Index(doc, idx => idx.Index("your_index_name"));

        if (indexResponse.IsValid)
        {
            Console.WriteLine("Document indexed successfully.");
        }
        else
        {
            Console.WriteLine($"Failed to index document: {indexResponse.OriginalException.Message}");
        }
    }
}

public class Program
{
    public static void Main(string[] args)
    {
        var node = new Uri("http://localhost:9200");
        var esHelper = new ElasticsearchHelper(node);

        esHelper.AddNewParameterToIndex("your_index_name");

        var doc = new Document
        {
            Id = "1",
            Title = "Sample Title",
            Content = "This is a sample content.",
            NewParam = "default_value"
        };

        esHelper.AddDocument(doc);
    }
}