We have an object with an External Object Connection. There's a property on the objects that we want removed. I opened the External Object Type Connector for the object, and under Column mappings, I deleted the mapping of this value to the property. Now when I look at the object properties in Configuration, the property is no longer listed as being a part of that object. I then refreshed the objects. But I still have objects that show that property on the metadata card. How do I remove the property from the existing documents?