How to find duplicate email address when update contact module in record.js?

My goal is to make it impossible to add new email addresses when editing a contact, if they are already present in the system, as well as the impossibility of saving a contact if such an email address already exists. In other words, to exclude the appearance of duplicate email addresses. There is documentation here, but it doesn't work in my case. support.sugarcrm.com/.../

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