Is Rolling restart documentation correct?

I have read the documentation for rolling restart at.

and more about cluster.routing.allocation.enable

What i am confused about is step 7, Re-enable shard allocation .
Why would you set it to null when the default value should be all .
Would not null mean none ?


A value of null removes any user-specified value for the setting, reverting it back to the default value (which is specified in the Elasticsearch source code) of all.

You can be explicit if you prefer, and set it to all, but the effect is the same.

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Thank you George for the answer.

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