According to Protractor Angular 2 Failed: unknown error: angular is not defined angular selectors by.model are not supported.
I also went to http://www.protractortest.org/#/ and I noticed that seems that no change was made to fix this.
How can I set an input text using protractor and Angular 2?
EDIT
I can select my by making this:
let myelement: ElementFinder = element(by.css('.text-input'));
But I have several inputs on my html page. How can I have the 4th ion-input, per example?