Remove additional key generated by FirebaseDatabase

In Firebase Database I have a node "mazdoors" and below this I want only a key "userid" generated for each user and below this userid only some details which user has filled by using the android app. But problem is that Firebase Database adds a another key automatically below "userid". Due to this problem I am unable to fetch data of all users simultaneously.

Here is my code and link of photo-

myRef=FirebaseDatabase.getInstance().getReference();

myRef=firebaseDatabase.getReference("mazdoors").child(uid);

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