有没有办法检查 MongoDB 中数组值中的重复条目？

我正在尝试从深度嵌套的数组中删除重复值。我已经把数据库的结构放在下面。我想相互比较步骤的位置并检查重复项。我正在考虑使用db.collection.aggregate，但是在尝试搜索所有步骤时会出现问题，{ $unwind: '$mapbox.routes.legs.0.steps' }因为据我所知，这些步骤需要一个特定的索引。

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                "distance" : 105375,
                "duration" : 8261.3,
                "weight" : 11365.5,
                "weight_name" : "routability",
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                "legs" : [ 
                    {
                        "distance" : 105336.1,
                        "duration" : 8259.5,
                        "steps" : [ 
                            {
                                "distance" : 132.5,
                                "duration" : 50,
                                "geometry" : "iv||H_{f^w@b@??AFDZ??H`@?@DT??BL???B@LN`A??Lx@??BP",
                                "name" : "Mariaplaats",
                                "ref" : null,
                                "destinations" : null,
                                "exits" : null,
                                "driving_side" : "right",
                                "mode" : "driving",
                                "maneuver" : {
                                    "location" : [ 
                                        5.117934, 
                                        52.089493
                                    ]

有人知道我如何比较步骤的位置吗？