Delete to end of line in IntelliJ IDEA editor
Solution 1:
In Settings | Keymap find the EditorDeleteToLineEnd action, right click, assign a shortcut that you want (make a copy of the keymap as you can't modify the default one):
Solution 2:
Here for Mac users, to delete the current line in intellij : 
source: https://www.jetbrains.com/idea/docs/IntelliJIDEA_ReferenceCard_Mac.pdf
Solution 3:
According to the documentation, it does not support what you want. You can only delete the whole line (Ctrl+Y) or delete to word start/end (Ctrl+Backspace and Ctrl+Delete).
Solution 4:
To delete the whole line (for mac users):
⌘ + x