A common approach on wiki's, especially outside the content namespace, is for long running communication pages to have many archive pages under names such as {name}/Archive42. These pages all have very statistically similar content, but the "main" page should generally be ranked higher than all the archives. Look into ranking sub pages lower than their parent page.
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A work-around is currently in place for auto-complete but we need to fix full text; we'll also need to figure out scoring on this.