[8.x] [Transform] Create upgrade mode (#117858) #119352
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Prevent writes to the Transform system index while it is being reindexed during upgrade. - Add a new REST API, `_transform/set_upgrade_mode`, similar to `_ml`, which will enable via `?enabled` or disable (when omitted). - Add a new Transport action, enabling or disabling upgrade mode. When enabled, all Transforms will abort and move into the `waiting` state, preventing Transforms from running and writing to the system index. - Hook into the System Index upgrade action, calling the new Transform action to set and unset upgrade mode. Co-authored-by: David Kyle <[email protected]> Co-authored-by: Elastic Machine <[email protected]>
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Backports the following commits to 8.x: