Dear Elastic team, we would like to bring to your attention that you recently made a change to your source code and license agreement which violates the GPLv2 license under which the NXT code has been released.
The problematic commit is SHA 74138264 by myalcin81, 04/09/2017 01:15 AM "missing NXT strings converted to XEL strings on relevated Web API." which replaced all copyright messages from Nxt to XEL.
We kindly ask you to revert this change as soon as possible.
You are of course free to add a separate copyright notice for your work.
I think what this refers to is that a while back, someone went through the code and changed some of the names of files from NXT, since nearly all the files had NXT names.
So presumably, some of the files should not have been renamed and need to be changed back.