It's an environment variable. I set it in the systemd service that I run ES from, don't know how it's launched in this addon.
It is launched like this:
can that variable be added there in some way?
By the way, I spent whole day trying to compile and it worked but the binary I get does not run in LE 9.2 beta... segmentation fault!! , so if we can get it working jus with that variable fix will be awesome