[`Setting.versionSetting`](https://github.com/elastic/elasticsearch/blob/0652a5915586abbcdfdfffa91a391740f0147752/server/src/main/java/org/elasticsearch/common/settings/Setting.java#L1275) (only used by index compatibility setting) does not use the `Validator` passed in - its just discarded. Looks like it's been like this since it was introduced by https://github.com/elastic/elasticsearch/pull/83264 in 8.2.0.

Enabling this causes some tests to fail. Enabling this may cause problems for indexes that have a wonky setting already applied.
server/src/main/java/org/elasticsearch/common/settings/Setting.java
/**
     * Returns <code>true</code> if this setting is final, otherwise <code>false</code>
     */
    public final boolean isFinal() {
        return properties.contains(Property.Final);
    }
    public final boolean isInternalIndex() {
        return properties.contains(Property.InternalIndex);
    }
    public final boolean isPrivateIndex() {
        return properties.contains(Property.PrivateIndex);
    }
    /**
     * Returns the setting properties
     * @see Property
     */
    public EnumSet<Property> getProperties() {
        return properties;
    }
    /**
     * Returns <code>true</code> if this setting must be filtered, otherwise <code>false</code>
     */
    public boolean isFiltered() {
        return properties.contains(Property.Filtered);
    }
    /**
     * Returns <code>true</code> if this setting has a node scope, otherwise <code>false</code>
     */
    public boolean hasNodeScope() {
        return properties.contains(Property.NodeScope);