[KinoSearch] Freshness queries

[Nick Wellnhofer]

I'd like to boost search results depending on their age. I.e. newer
documents get promoted, older ones get demoted. AFAICS this is currently
not possible. I think I could implement it quite easily by stealing code
from MatchAllQuery and RangeQuery.

I would propose the parameters fresh_age, fresh_score, stale_age,
stale_score. The score of documents newer than fresh_age would be
multiplied by fresh_score. The score of documents older than stale_age
would be multiplied by stale_score. For documents in between I would
interpolate linearly.

What do you think?

Nick


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