MongoDB查询不起作用，抛出错误：找不到$ geoNear查询的索引

Question

尝试对monggodb进行查询时出现此错误：

error processing query: ns=makenoisetogether.users limit=10Tree: GEONEAR field=location maxdist=10000 isNearSphere=0 Sort: {} Proj: { name: 1, location: 1, musicLinks: 1, genres: 1, photo: 1, slug: 1 } planner returned error: unable to find index for $geoNear query

我有一个控制器试图根据纬度和纬度上的参数获取用户：

  const coordinates = [req.query.lng, req.query.lat].map(parseFloat);
  const q = {
    location: {
      $near: {
        $geometry: {
          type: 'Point',
          coordinates
        },
        $maxDistance: 10000 // 10km
      }
    }
  };

  const users = await User.find(q).select('name location musicLinks genres photo slug').limit(10);
  res.json(users);
};

此行发生错误：

const users = await User.find(q).select('name location musicLinks genres photo slug').limit(10);

任何想法可能是什么问题？

这是我的用户模式，在这里我已经为2dsphere添加了位置索引：

const userSchema = new Schema({
  email: {
    type: String,
    unique: true,
    lowercase: true,
    trim: true,
    validate: [validator.isEmail, 'Invalid Email Address'],
    required: 'Please Supply an email address'
  },
  created: {
    type: Date,
    default: Date.now
  },
  location: {
    type: {
      type: String,
      default: 'Point'
    },
    coordinates: [{
      type: Number,
      required: 'You must supply coordinates!'
    }],
    address: {
      type: String,
      required: 'You must supply an address!'
    },
    vicinity: {
      type: String,
    },
  },
});

userSchema.index({ location: '2dsphere' })