You can do this in different ways. As @dadoonet said you can import/export the objects.
You also can edit the object and change the "index": field as in this image:
Or you can also delete the index field and assign it a search, which would make you easier to switch index-patterns on the future just changing the index pattern of the search in discover and saving it, but remember that both indices the older and the newer must have the same fields and mappings, if you have adopted ECS the switch with this method should be easier
To assign it a search you just have first to get searchid, for this open the search on discover and take it from the url as shown in the image:
And then in Kibana Saved Objects edit the visualization, remove the index field and add your id to the following field
I hope this helps