First of all, you'll have to create a new index with the updated mappings and reindex your data there.
Take these mappings, edit them as necessary, and pass them as the settings of the new index when using the index creation API call or issue a subsequent mapping put call. Finally reindex your data into the new index.
That is weird: I once got a package from a US based company that was missing the leading zero in my postal code. As a result I thought the US don't have this issue - but if it's the same there, I'm wondering who implemented the form I filled in back then.
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