K12 Blue water light meaning??

Hi I am really new to having a Nissan. I have a blue water light that comes on initially when I start driving the car then disappears fairly quickly generally. I have looked in manuals to see what it means but I honestly don't understand what it means and if it's normal etc, the explanation isn't clear at all in the book? Can anyone tell me if this is ok/normal or a problem please?

Many that's in advance. :))
 
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