java - 如何使用 Elastic Search Java API 设置父/子关系？

Question

我正在尝试使用 Elastic Search Java API 创建两个文档，一个构建另一个的子文档。

我的代码看起来像这样:

public void createRecord(Road road, Car car) throws Exception{
  ObjectMapper objectMapper = new ObjectMapper();

  String roadJson = objectMapper.writeValueAsString(road);
  String carJson = objectMapper.writeValueAsString(car);

  Client client = TransportClient.builder().build().addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("localhost"), 9300));

  IndexResponse response = client.prepareIndex("myIndex", "roadType").setSource(roadJson).get();

  client.prepareIndex("myIndex", "carType").setParent(response.getId()).setSource(carJson).get();
}

这段代码成功地创建了一个道路文档，但是当它去创建一个汽车文档时，我得到了错误:

java.lang.IllegalArgumentException: Can't specify parent if no parent field has been configured

如何正确创建两个与 ES Java API 形成父/子关系的 Elastic 文档？

Answer 1

看起来您没有配置“carType”映射以将“roadType”指定为父级。

"mappings": {
    "roadType": {
        "properties": {
        }
    },
    "carType": {
        "_parent": {
            "type": "roadType"
        },
        "properties": {
            "make": {
                "type": "string"
            },
            "model": {
                "type": "string"
            }
        }
    }
}

有关详细信息，请参见此处:https://www.elastic.co/guide/en/elasticsearch/guide/current/parent-child-mapping.html