Question about Upgrading a cluster

Hi dears
I have a question about upgrading process.
I have already upgraded a dev environment cluster but the concern is about (maybe) some system index of production cluster.

I want to know what will happen to my saved queries , dashboard and visualization after upgrading? Are they still remain?

For instance, my production cluster has about 30 saved queries (bellow picture is my test environment)
What happens to those saved queries after upgrading?

And also my dashboard and visualization, watcher...?

Is there any solution that I can backup these objects for sure?!?
(I'm using version 7.6.2 and trying to upgrade to 7.16.2)
Thank you so much

Yes. Everything will be remaining as all elements are stored in Elasticsearch indices.

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Thank you so much

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