Magnus, I am attaching a screenshot of my security settings and you will see that I have created a user ('pstarrett'), who has admin rights and admins are allowed to write indices (see red arrows showing all three things). So, I do not understand why I am getting the authentication error. There must be something wrong with my cluster or something - in other words, the problem is on the ES side, not my code or other configuration issue. Appreciate any help as this is a show stopper otherwise. Thank you!
