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Provide a narrative description of what you are trying to accomplish.
I just wanted to play around with the examples to realize a progressbar with a JsPush-adapter.

Code to reproduce the issue

See the examples in the documentation and my question in stackoverflow, too:
https://stackoverflow.com/questions/50396543/zend-framework-3-how-to-use-and-push-update-progressbar

Expected results

The update-function should have been called and the progressbar should have been updated.....

Actual results

Nothing happened.

After renaming the update function to "ZendProgressBarUpdate" and adding the line

$this->adapter->setUpdateMethodName("ZendProgressBarUpdate");

everything worked as expected.

So I suggest to update the manual.