[8.0] Script: Implicit context cache (#81552) #81559
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The script context cache is deprecated. In 7.16 the default value of `script.max_compilation_rate` was switched from `"use-context"`, to `"150/5m"`. That means uses would have to explicitly set `"use-context"` to use any of the context cache families of settings: `script.context.*.max_compilations_rate` `script.context.*.cache_max_size` `script.context.*.cache_expire` On upgrades to 7.16, if the customer was using the default and had set any of those settings without setting `script.max_compilation_rate: "use-context"`, the upgrade would be fail. To avoid an unintentional breaking change, the script service will now **implicitly** use the script context cache if `script.max_compilation_rate` is **unset** and any of the context cache family of settings is set. The context cache will also be used if `script.max_compilation_rate: "use-context"`, as before. Fixes: elastic#81486
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Backports the following commits to 8.0: