How to make redirect, when I use adress bar?

I have a dev site version:
I want make a redirect: when I print to the adress bar index.html i want the line change to
At the root of the public directory exist _redirects file with settings:
/index.html /
Also, I have a Pretty URLs settings → Pretty URLs are enabled.
What I am missing for?

@ab_softevol See my post here for things you may be getting confused with:

In the _redirects file format, the force would be specified as

/index.html /  301!