java - 如何在ElasticSearch的painles脚本中实例化对象

Question

在 Java 中，我有带有嵌套对象的实体:

public class MyData {
    @Id
    public UUID id;
    @Field(type = FieldType.Nested)
    public List<Entry> entries = new ArrayList<>(); // Entry is the class with two fields: String and int
}

我想更新entries添加新的“Entry”实例。

            Script script = new Script(
                    Script.DEFAULT_SCRIPT_TYPE,
                    "painless",
                    "ctx._source.entries += params.entry",
                    new HashMap<>(){{put("entry", value}}
            );

如果值是 json，那么我会收到错误:

Cannot cast java.lang.String to java.util.ArrayList

如果 value 是对象本身:new Entry("abc", 0) 那么我收到错误:

java.lang.IllegalArgumentException: cannot write xcontent for unknown value of type class com.x.dto.Entry. And it doesn't accept Map either.

我知道这应该非常简单，但还没有找到如何实例化所需的对象。

Answer 1

可以这样完成:

            Script script = new Script(
                    Script.DEFAULT_SCRIPT_TYPE,
                    "painless",
                    "ctx._source.entries.add(['id': params.id, 'count':0])",
                    new HashMap<>(){{put("id", myValueHere}}
            );