[7.x] Support dependent validation for index settings (#70144) #70275
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Backport of #70144
A setting validator can declare settings that the validation depends on,
but when updating index settings, we eagerly validate the settings
before submitting the cluster state update and here we do not know the
existing settings. With this commit, we ensure that the pre-validation
only validates the keys and not the values, leaving the value validation
to after we have combined existing settings with the new settings on a
per index basis.