item:{
       //mandatory field, will exist in each document
       id: "1",
       //non-mandatory fields, may or may not exist in each document
       name: "john",
       age: "22",
       email:"john@gmail.com" ,
  }

item:{
       id: "1",
       name: "john",
       age: "22",
       gender: "male",
       email:"john@gmail.com"