Refactor json parsing in immutable handlers #88492
Merged
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The current immutable handlers assume json input, which is inefficient for use by plugins and modules. This PR refactors the xcontent parsing in a separate method to be used only when we actually have json input (file based settings).
This way the immutable state controller can work with POJOs and xcontent too.
This PR is split off from #88224 to reduce the PR size.