Custom fields database key don't update under Search Setup?

When I go to setup the search page using the drop down box to select the database key, (under Theme Setup > Search Setup > Add a custom field etc.) the previously named database keys show up, for example I used to have the database key name as “key_style” but I later changed it to “style” to make the name less complicated etc.

I updated the Plugins > Toolbox > Update Tables > Update

I don’t see any updated custom field names.

What should I do? As the search setup does not recognised sample listings when I try out the search feature?