Postman GET请求中嵌套对象的问题

Question

我收到此请求的对象： https://X.X.X.X:6200/somewhere-2019-08-12/_search?size=1

{
                "_ddddsss": "dated55d",
                "_tttt": "rr",
                "_cccc": "ree",
                "_aaaaa": 0.0,
                "_bbbbbb": {
                    "destinationmac": "bb",
                    "tc": 0,
                    "type": "ALLOW",
                    "aaaaa": 1111111111111111111,
                    "f": "somethin",
                    "d": "5.5.5.5",
                    "source": "5",
                    "s": "5",
                    "m": "x",
                    "sourceip": "0.0.0.0",
                    "b": 5455555555555,
                    "obb2": {
                        "acl": "a2",
                        "pancake": "a2",
                        "a": "a2",
                        "yes": "a2",
                        "maybe": "a2",
                        "spgName": null,
                        "vrfId": "a2",
                        "sanem2": "a2",
                        "sane2": null,
                        "src-subnetmem": "a2",
                        "name2": "a2",
                        "name1": "somewhere",
                        "name": "a5",
                        "src-zonemem": "DL_ZONE",
                        "name222": "2957981673",
                        "name22222": "pp",
                        "something": [
                            {
                                "a": "6e",
                                "b": "Null",
                                "c": "Null"
                            }
                        ],
                        "somehwer": "ch",
                        "wolcome": "br"
                    },
                    "some": {},
                    "timestamp": 1565589864000
                }
            }

现在，例如，如果我将size参数更改为10，我将收到10个这些对象。现在，我想选择所有时间戳值为1565589864000的对象，例如仅通过更改url并创建查询字符串即可。 我不知道如何为嵌套对象创建查询字符串。尝试了一些，更有意义的是这样的：

https://X.X.X.X:6200/somewhere-2019-08-12/_search?size=10&_source[timestamp]=1565589864000

但是它不起作用。欢迎任何帮助。