If the number of different date terms causes this effect, why not "round"
the date to the nearest or next midnight while indexing. Thus, filtering
for the last 15 days would require walking over 15-17 different date terms.
If you don't do this, the number of different terms will be the same as
the number of documents you indexed, explaining the slowing down when you
have more results.
I wholeheartedly concur. And in fact I don't use the Keyword(String, Date) thing at all if I just need to represent a date. I use YYYYMMDD as a String instead. It's just too fiddly to deal with dates using the built-in handling of it.
Erik
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