Alternatively you can go to Google+, right-click the search bar and select "Add As Search Engine..." You can then change the keyword to "+" or "plus", and do the same thing.
That won't live update with results as you type though. Search+ pulls in recent results from Plus and lists them in the drop down. If you select a result it will open that post directly instead of going to Google+ and showing results.
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[ 4.2 ms ] story [ 34.8 ms ] threadIt isn't a Google+ feature that is rolling out. It is a Chrome extension I built that you install. If you don't install it it won't work.