4b4fbc160d
Backport of #53982 In order to prepare the `AliasOrIndex` abstraction for the introduction of data streams, the abstraction needs to be made more flexible, because currently it really can be only an alias or an index. * Renamed `AliasOrIndex` to `IndexAbstraction`. * Introduced a `IndexAbstraction.Type` enum to indicate what a `IndexAbstraction` instance is. * Replaced the `isAlias()` method that returns a boolean with the `getType()` method that returns the new Type enum. * Moved `getWriteIndex()` up from the `IndexAbstraction.Alias` to the `IndexAbstraction` interface. * Moved `getAliasName()` up from the `IndexAbstraction.Alias` to the `IndexAbstraction` interface and renamed it to `getName()`. * Removed unnecessary casting to `IndexAbstraction.Alias` by just checking the `getType()` method. Relates to #53100 |
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