ElasticSearch 索引名称为空

Question

System.ArgumentException: 
    Index name is null for the given type and no default index is set. 
    Map an index name using ConnectionSettings.DefaultMappingFor<TDocument>()
    or set a default index using ConnectionSettings.DefaultIndex().

错误信息在上面！

var url = configuration["elasticsearch:url"];
var defaultIndex = configuration["elasticsearch:index"];
var settings = new ConnectionSettings(new Uri(url)).DefaultMappingFor<MachineConnectionInformation>(x=> x.IndexName(defaultIndex));
                
            
var client = new ElasticClient(settings);           
client.Indices.Create("machine", index => index.Map<MachineConnectionInformation>(x => x.AutoMap()));
services.AddSingleton(client);

上面是我的扩展代码！

var response = _client.IndexDocument(model);  //this is where i add my model to elastic.

Answer 1

您将configuration["elasticsearch:index"] 设置为connection setting 中的默认索引，但您正在创建索引machine，错误背后的原因是configuration["elasticsearch:index"] 的索引值不是Elasticsearch 中的现有索引。