unknown operator: $neq

array-index的结构如下：

{  
  "addr": [  
    {  
      "id": "1111"  
    },  
    {  
      "id": "1111"  
    }  
  ],  
  "name": "测试名称",  
  "nextseq": "$seq",  
  "seq": 3  
}

const db = uniCloud.database();  
const doc = db.collection('array-index');  
const dbCmd = db.command  

const res = await doc.where({  
    id:'5e7464822fe447004d49617a',  
    addr: dbCmd.elemMatch({  
      id: dbCmd.neq(nextid)   
    })  
  }).update({  
    'addr': dbCmd.push({  
      id: nextid,  
      name: '测试'  
    })  
  })

上传并运行云函数，爆出

errCode: InternalServerError | errMsg: 云数据库系统错误 << unknown operator: $neq  
Error: errCode: InternalServerError | errMsg: 云数据库系统错误 << unknown operator: $neq  
    at e.then.catch.e (/tmp/function/@dcloudio/serverless/lib/aliyun/uni-cloud.js:1:1025)  
    at <anonymous>  
    at process._tickCallback (internal/process/next_tick.js:188:7)

我是MongoDB的初学者，我有看uniCloud文档，这样是哪个地方出问题了吗？
顺便在问下，如何自定义索引，比如addr是一个对象数组字段，那么如何支持id唯一呢，我在后台那边配置好像没有效果

但是我换成eq则可以运行：

const db = uniCloud.database();  
const doc = db.collection('array-index');  
const dbCmd = db.command  

const res = await doc.where({  
    id:'5e7464822fe447004d49617a',  
    addr: dbCmd.elemMatch({  
      id: dbCmd.eq('1111')   
    })  
  }).update({  
    'addr': dbCmd.push({  
      id: nextid,  
      name: '测试'  
    })  
  })

则成功插入：

{  
  "addr": [  
    {  
      "id": "1111"  
    },  
    {  
      "id": "1111"  
    },  
    {  
      "id": "OITonzrZR",  
      "name": "测试"  
    }  
  ],  
  "name": "测试名称",  
  "nextseq": "$seq",  
  "seq": 3  
}