cannot delete index from dashboard

(from github.com/freestyle68)
Hi,

Fess 12.1.1 (zip version).
When I try to delete an index from Kopf interface I get the error:

"error": "Content-Type header [text/plain;charset=UTF-8] is not supported",
  "status": 406

With Fess 11.4.10 no problem.

Thank you

(from github.com/marevol)
Fixed in https://github.com/codelibs/elasticsearch-kopf/tree/fess-6.0
It’ll be fixed in a next release.

(from github.com/freestyle68)
It works, thank you!