Can Elastic Search be configured to prevent searching by Emplid and Empl Rcd?

We have a requirement to prevent searching by Employee Id or Employee Record number for privacy concerns.

Today, typing the value '0' in the Company Directory search field returns thousands of employees (assuming this is matching on Employee Record number), or an exact Employee ID returns the employee's information. We have configured the Search Framework > Designer > Search Category not to use either field, but had to add them back to the Search Definition Map Search Attributes, as no data was being returned for any search. We'd rather not customize any of the code, if possible.

Any suggestions would be very helpful!