Removal of _doc in 5.10.0 version

I have a table with defination as follows :

CREATE TABLE users (
    id INT PRIMARY KEY,
    name STRING,
    age INT
);

I have 2 records in it. The count(_doc) for users table is also 2. As per latest release doc, _doc should be removed. How do i implement this is my scenario?

_doc is just an internal (undocumented field). It is not directly related to the removal of the recovery source.