Object is duplicated when saving after renamed

[gillyb]

If you create an object (saved search/visualization/dashboard), and then change the title of the object in the settings tab.
When you open that object again, and make a change, and save it, it will create a duplicate.
(Event after asking you if you want to overwrite the object).

This is because the object id's are actually "slugs" of the title of the object.
When you rename the title of the object in the "settings" page, only the title is updated, and not the id.
Then when the new object is saved, you get two objects with the same title, but different id's.

[marcinkubica]

Ocassionally I'm getting this also on objects I don't rename, buy just save
changes. Especially when doing a lot of fiddling with few kibanas open on
couple of Chrome browsers.

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[spalger]

I think this is covered by #2735