Relates to:

• If user reindexes sample data from 6.8.x in 7.16 and then tries to install them in a new space Kibana displays internal server error #120137
• Inform user about changes to reindexed data in Upgrade Assistant #121220

When Upgrade Assistant reindexes 6.x indices, it renames them and prefixes them. This can be disruptive for users in a few ways:

• Indices are now presented different in Index Management
• Delete Index requests will fail if they use the original index name

This could also be confusing if future upgrades require subsequent reindexes. Will indices accumulate reindexed-reindexed- prefixes?

One possible solution to this problem could be to provide a tool in Index Management that identifies UA-reindexed indices based on their prefix, and handles "reindexing them back" for you, so they have their original name again.

We can also make it easier to search indices based on their aliases, or otherwise visualize the associations between indices and aliases.