This widget can be used for searching the site content by using Google Search engine. 
Steps to setting up:
1.  Go to Control Panel -> Settings -> Global Settings -> Google Search
Enter Google Custom Search Engine ID  
(get your custom Search Engine ID from https://www.google.com/cse)

2. Create Google Search Widget
a) Go to the layout of the page in which Google Search Widget is placed
b) Click Create New Widget button
c) Select Google Search Widget from the list
d) Enter widget description or widget title (optional)
e) Click Save button

3. Drag the newly created Google Search Widget from the widget panel to the layout

4. Save the layout

Sample of Google Search Widget in page:

Search result shows up in a pop-up page like below

Updated:  17 Sep 2021