When indexing search results, add the current date, so results can be: 1) ignored by the client if they are too old; (they might still be useful in this, because they give the client a reason to get fresh results from whatever resource produced the result); 2) removed by the server if they are really old.
When indexing search results, add the current date, so results can be: 1) ignored by the client if they are too old; (they might still be useful in this, because they give the client a reason to get fresh results from whatever resource produced the result); 2) removed by the server if they are really old.