Can't Turn Off Digit Grouping in Search Field Values Format

I am using the search app and am trying to prevent users from putting anything but numbers in the search field because if they put something other than a number and hit search, they get a sql error. But when I select “Number Auto-Complete” as the field type it will put commas as it attempts to digit group. This causes sql errors again. Why can’t I turn digit grouping off?

Any ideas?

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