Updating intellisense in visual studio 2016
Fortunately for the SQL Server Community, Microsoft has made SQL Server Management Studio a product on its own and is providing updates directly for the product.
Anytime you start SQL Server Management Studio it automatically checks for updates, and when an update is available you will receive a notification like the one in the next image.
It contains among other things the intellisense database (it should be possible to delete only the files specific to intellisense, if we knew which ones).
Note that if you delete the whole folder you will lose your window layout configurations etc.
If you decide to apply the update and click the notification, your default web browser will open a web page (https://msdn.microsoft.com/library/mt238290.aspx) where you can download the new version of the web installer.
When you click on that option a window will pop up displaying the current version of SQL Server Management Studio components and the latest version available.
Let me tell you that, this is not due to the installation of new plugin but with the older plugin that you just uninstalled or expired.
If you faced similar issue in your Visual Studio IDE and unable to bring back the beloved intellisense menu, here is the solution for you.This is a common issue that the developer faces after the productivity plugin license expires or the developer uninstalls to install a new set of tool.