In the previous versions of Eclipse this menu item was available in the context menu (right-click on the server in the "Servers" view):
Why is it missing now?
You have probably installed Eclipse for Java Developers instead of Eclipse IDE for Enterprise Java Developers, server tab and some other are not available.
In the Java EE perspective of Eclipse, you will find the Servers tab at the bottom. Since no server is added yet, you will see a link in the tab as shown in the following screenshot—No servers are available. Click this link to create a new server....
Not tested, but try this:
NOTE: If already checked try to reinstall + try to reinstall Eclipse WebTools
Resources: https://stackoverflow.com/a/32739665/5364144
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