Java等价于elasticsearch CURL查询？

我的项目有一个新的要求，就是将当前postresql中的所有数据迁移到elasticsearch。成功迁移了我的所有数据，但我一直在编写java代码，以便在弹性搜索索引中搜索一些数据

点击索引的示例结构附在下图中：

我需要从索引中找到

活动的平均值。attentionLevel

我写了下面这样的查询来查找平均值：

GET proktor-activities/_search
{
"aggs" : {
    "avg_attention" : { 
        "avg" : { 
            "script" : "Float.parseFloat(doc['activity.attentionLevel.keyword'].value)" }
         }
    }
}

请帮助我找到与java等效的代码，以便执行相同的操作

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提前感谢

使用Elastic的RestHighLevel API会是这样的：

    // Create the client
    RestHighLevelClient client = new RestHighLevelClient(
            RestClient.builder(new HttpHost("localhost", 9200, "http")));

    // Specify the aggregation request
    SearchRequest searchRequest = new SearchRequest("proktor-activities");
    SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
    searchSourceBuilder.aggregation(AggregationBuilders
        .avg("avg_attention")
        .field("activity.attentionLevel"));

    searchRequest.source(searchSourceBuilder);

    // Execute the aggreagation with Elasticsearch
    SearchResponse response = client.search(searchRequest, RequestOptions.DEFAULT);

    // Read the aggregation result
    Aggregations aggregations = response.getAggregations();
    Avg averageAttention = aggregations.get("avg_attention");
    double result = averageAttention.getValue();

    client.close(); // get done with the client

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