Running kernels other than python

Awesome project, lots of amazing work
The readme has the example of running clojure, but when I try running scala or elixir, Emacs hangs until I ^G trying to contact the kernel. Any ideas?
`Contacting host: localhost:8888`

```
#+BEGIN_SRC ipython :session iex :kernel elixir
a = 1
IO.inspect a
#+END_SRC
```

Meanwhiel I receive the following warning in another buffer:

```
Warning (python): Python shell prompts cannot be detected.
If your emacs session hangs when starting python shells
recover with ‘keyboard-quit’ and then try fixing the
interactive flag for your interpreter by adjusting the
‘python-shell-interpreter-interactive-arg’ or add regexps
matching shell prompts in the directory-local friendly vars:
+ ‘python-shell-prompt-regexp’
+ ‘python-shell-prompt-block-regexp’
+ ‘python-shell-prompt-output-regexp’
Or alternatively in:
+ ‘python-shell-prompt-input-regexps’
+ ‘python-shell-prompt-output-regexps’
```