elasticsearch - 包含空值后， Elasticsearch 更新失败

Question

我们最近升级到了 Elasticsearch v5和nest v5.6

我们试图将字段设置为null，但是默认的序列化设置将忽略null值。

var pool = new SingleNodeConnectionPool(new Uri("http://local:9200"));

var connectionSettings =
    new ConnectionSettings(pool)
    .DisableDirectStreaming();

var elasticClient = new ElasticClient(connectionSettings);

var indexName = "myIndexName";
var typeName = "myTypeName";
var documentId = 2;

var pendingDescriptor = new BulkDescriptor();
pendingDescriptor.Index(indexName).Type(typeName);

var pendingUpdate = new Dictionary<string, object>
            {
                { $"DocumentType_TAG_PENDING_Id", null }
            };

var updateRequest = new UpdateRequest<dynamic, dynamic>(indexName, typeName, new Id(documentId));
updateRequest.Doc = pendingUpdate;
elasticClient.Update<dynamic>(updateRequest);

这导致请求:

{"update":{"_id":2,"_retry_on_conflict":3}}
{"doc":{}}

字段值未设置为null

在阅读此处 https://www.elastic.co/guide/en/elasticsearch/client/net-api/5.x/modifying-default-serializer.html之后，我尝试将序列化器修改为包含空值

var connectionSettings =
    new ConnectionSettings(pool, connection, new SerializerFactory((settings, values) =>
    {
        settings.NullValueHandling = NullValueHandling.Include;
    }));

现在我的要求变成:

{"update":{"_index":null,"_type":null,"_id":2,"_version":null,"_version_type":null,"_routing":null,"_parent":null,"_timestamp":null,"_ttl":null,"_retry_on_conflict":3}}
{"doc":{"DocumentType_TAG_PENDING_Id":null},"upsert":null,"doc_as_upsert":null,"script":null,"scripted_upsert":null}

我收到以下错误:

{"error":{"root_cause":[{"type":"json_parse_exception","reason":"Current token (VALUE_NULL) not of boolean type\n at [Source: org.elasticsearch.transport.netty4.ByteBufStreamInput@181f5854; line: 1, column: 82]"}],"type":"json_parse_exception","reason":"Current token (VALUE_NULL) not of boolean type\n at [Source: org.elasticsearch.transport.netty4.ByteBufStreamInput@181f5854; line: 1, column: 82]"},"status":500}

请帮忙

Answer 1

到目前为止，我们有两种选择:

升级到v6，他们在其中分离了文档并请求序列化程序。
因此，我们可以自定义文档的序列化方式，而不会影响请求/响应头。有关更多信息，请参见https://www.elastic.co/guide/en/elasticsearch/client/net-api/master/custom-serialization.html

在请求后使用 Elasticsearch 低级客户端，避免使用嵌套序列化程序。
https://www.elastic.co/guide/en/elasticsearch/client/net-api/5.x/elasticsearch-net.html

我们的首选方法是在一切正常的情况下进行升级，并在出现任何问题时恢复为低级客户端