Yeah, there seems to be, generally speaking it's tilted towards more senior level folks, and projects, as Elixir isn't really on anyone's radar as an entry level language. Plus, understanding the concepts that make OTP great usually requires moderately thorough understanding of asynchronous and parallel programming.
I think it's been growing pretty steadily, IMHO, because Elixir/Erlang is such a wonderful platform for development, BEAM is extremely battle-tested at this point, and performance is quite good for how easy it all is... also, while I spoke against it, when you absolutely must, to you _can_ write something in C fairly easily (I've _never_ had a good time trying to do C-interop in Ruby or JavaScript for example).