fbbb04b87e
This commit adds the infrastructure to make settings that are updateable resetable and changes the application of updates to be transactional. This means setting updates are either applied or not. If the application failes all values are rejected. This initial commit converts all dynamic cluster settings to make use of the new infrastructure. All cluster level dynamic settings are not resettable to their defaults or to the node level settings. The infrastructure also allows to list default values and descriptions which is not fully implemented yet. Values can be reset using a list of key or simple regular expressions. This has only been implemented on the java layer yet. For instance to reset all recovery settings to their defaults a user can just specify `indices.recovery.*`. This commit also adds strict settings validation, if a setting is unknown or if a setting can not be applied the entire settings update request will fail. |
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