[8.0] All system indices are hidden indices (#79512) #81388
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System indices should be hidden from users. Since they are already restricted indices, a users that can't view restricted indices already can't see or access them, but they should also be hidden for superusers or users that are otherwise granted advanced privileges. To the greatest degree possible, we apply hidden settings in the transport layer, so that the system can create an index or alias that is set to visible, for example, when operating in a mixed cluster mode. However, in the case of aliases created by templates, we hide the alias in the service layer. This change has broken a number of tests that were relaying unnecessarily on wildcard searches. In general, the fix for these issues was to apply expand_wildcards=open,hidden to the request. * Force system indices to be hidden in IndexMetadata * Hide system data streams * Update feature migration tests * ML datafeed config defaults to searching hidden indices * Prevent unmanaged system indices from becoming visible * Change validation in TransportUpdateSettingsAction * Validate index creation settings in transport action * Make sure system data stream backing indices are hidden * Make sure transport request adds hidden index setting if missing * Validate and set default for autocreated system indices * Add some code to hide system aliases * Hide system aliases in create index service * Hide system aliases when adding them via alias endpoints * Check system indices when simulating and validating templates * Add known issue for reenabling tests * Update docs/changelog/79512.yaml
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Backports the following commits to 8.0: