Hi Mateusz,
thank you very much for the update, it looks so far that you nailed it this time 
. I’m gonna do some more testing (so far I tested it only on my local playground) however I have a feeling that this is exactly what we were looking for. Only one thing makes me slightly confused, if the kibana setting is “ro”, I cannot execute any REST calls in Dev Tools. Could you please confirm that this is the intended behaviour (RoR documentation is not so clear)?
I think I understand what you mean with a custom header (haven’t tested it yet though but I believe I can use it with the headers_or key the same way you used it in the sample config).
Regards,
Pavel