使用Java在Elasticsearch中聚合嵌套文档

Question

这是我在Elasticsearch中索引的映射。如何使用Java中的Rest高级客户端在字段名称上汇总转销商？

PUT /index
{
    "mappings": {
        "properties" : {
            "resellers" : { 
                "type" : "nested",
                "properties" : {
                    "name" : { "type" : "text" },
                    "price" : { "type" : "double" }
                }
            }
        }
    }
}

示例文档：

[{"reseller1":{"name":"name1", "price":100}},
{"reseller1":{"name":"name2", "price":200},
{"reseller1":{"name":"name3", "price":100}},
{"reseller1":{"name":"name4", "price":300}}]

如果我想基于价格进行汇总，那么我希望输出如下所示：

"price":100 2 docs
"price":200 1 docs
"price":300 1 docs