使用Nest + C#查找弹性搜索中字段/ Attachment.Content为空的文档

var settings = new ConnectionSettings(new Uri("http://your-elasticsearch-url:port"))
    .DefaultIndex("your-index-name"); // 设置默认索引

var client = new ElasticClient(settings);

var searchResponse = client.Search<YourDocumentClass>(s => s
    .Query(q => q
        .Bool(b => b
            .Must(m => m
                .Exists(e => e
                    .Field(f => f.YourField) // 你要查找的字段
                ),
                m => m
                .Bool(b1 => b1
                    .MustNot(mn => mn
                        .Exists(ex => ex
                            .Field(f => f.Attachment.Content) // Attachment.Content字段为空
                        )
                    )
                )
            )
        )
    )
);

if (searchResponse.IsValid)
{
    var documents = searchResponse.Documents;
    
    foreach (var document in documents)
    {
        // 处理查询到的文档
        Console.WriteLine(document.Id);
    }
}
else
{
    Console.WriteLine("查询失败：" + searchResponse.ServerError?.Error);
}