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Rolling Full Text Index. Is this possible?

We have a requirement for a rolling full text index. The way it is envisaged this will work is by date, i.e. only index the last 'x' months worth of content.

Is this possible?

I know we can decide what to index via the a_full_text attribute, but how would we be able to remove items from the index once they are older than 'x' months?

Could we just set a_full_text to FALSE and save the object?, and what would this do? Would it remove any entries from the full text index or would it just remove the object from the list of objects matching a query?