I have a data structure like 

```
 /Split       // Collection
   {authid}   // Document
      /SentIvitation //Collection
          {auto-id}  //Documnet
            amount    //array
             0:10
             1:10
             2:10
             Phonenumbers//array
               0:987654321
               1:123456789
               2:234567890

```

I need to query all the elements in Phone number and I have to check whether these phone numbers is already exist in another collection.
The next path of my data structure is

```
/deyaUsers   //Collection
  {authid}.   //Documnet
      Name: "abc"
      Email: "abc@gmail.com"
      Phonenumber:987654321

```

Is it possible in firestore without any indexing?