Elytra Flight Indicator [Vanilla Datapack] Mod

On endless journeys through the outer End in search of cities to loot, Captain_Awesum and I sometimes got disoriented in an empty void and didn't know if he was falling to his death. This datapack fixes that by adding a little indicator below your crosshair that shows whether your elytra is activated or not. It also works as a server plugin! 

The indicator is off by default. To open the menu and toggle the indicator on (or back off) for yourself, hold an elytra in your offhand and jump. 

Intuitive, non-invasive design- The indicator icon only shows while you are wearing an elytra and are in the air 
Simple toggling- Each player can enable and disable their indicator with the press of a button, from anywhere in the world 
Easy to install- Just drag and drop the file into your world, no modloaders necessary 
Lightweight and efficient- With only a dozen simple commands on loop, there is no effect on lag 

Compatable with vanilla 1.13 and 1.13.1. It should also work on modded worlds/servers as long as the commands aren't edited.