如何在HazelcastJsonValue中使用聚合？

<dependency>
    <groupId>com.hazelcast</groupId>
    <artifactId>hazelcast</artifactId>
    <version>4.2</version>
</dependency>

import com.hazelcast.core.Hazelcast;
import com.hazelcast.core.HazelcastInstance;

public class HazelcastExample {
    public static void main(String[] args) {
        HazelcastInstance hz = Hazelcast.newHazelcastInstance();
    }
}

import com.hazelcast.core.HazelcastJsonValue;

public class HazelcastExample {
    public static void main(String[] args) {
        HazelcastInstance hz = Hazelcast.newHazelcastInstance();

        HazelcastJsonValue jsonObject = new HazelcastJsonValue("{\"name\":\"John\", \"age\":30}");
    }
}

import com.hazelcast.core.Hazelcast;
import com.hazelcast.core.HazelcastInstance;
import com.hazelcast.core.IMap;

public class HazelcastExample {
    public static void main(String[] args) {
        HazelcastInstance hz = Hazelcast.newHazelcastInstance();

        IMap<String, HazelcastJsonValue> map = hz.getMap("jsonValues");
        HazelcastJsonValue jsonObject = new HazelcastJsonValue("{\"name\":\"John\", \"age\":30}");
        map.put("exampleJson", jsonObject);

        HazelcastJsonValue retrievedJsonObject = map.get("exampleJson");
        System.out.println("Retrieved JSON: " + retrievedJsonObject.toString());
    }
}

import com.hazelcast.core.Hazelcast;
import com.hazelcast.core.HazelcastInstance;
import com.hazelcast.core.IMap;
import com.hazelcast.aggregation.impl.StringMaxAggregation;

public class HazelcastExample {
    public static void main(String[] args) {
        HazelcastInstance hz = Hazelcast.newHazelcastInstance();

        IMap<String, HazelcastJsonValue> map = hz.getMap("jsonValues");
        HazelcastJsonValue jsonObject1 = new HazelcastJsonValue("{\"name\":\"John\", \"age\":30}");
        HazelcastJsonValue jsonObject2 = new HazelcastJsonValue("{\"name\":\"Jane\", \"age\":25}");
        map.put("json1", jsonObject1);
        map.put("json2", jsonObject2);

        StringMaxAggregation stringMaxAggregation = new StringMaxAggregation("name");
        String maxValue = map.aggregate(stringMaxAggregation);
        System.out.println("Max name value: " + maxValue);
    }
}