In a word, “yes”. For time routed alias, you also have to be aware of the
nature of your data. Take the canonical example of news stories for instance,
and let’s assume that every day a new collection is created.
Now a hot news story breaks and the news is flooded with the latest story,
“Hurric
Yes, the IDFs will be different. You could probably implement a custom
component that would take term statistics from the previous collections to
pre-populate the stats of the current collection, but this is an uncharted
area, there’s a lot that could go wrong. Eg. if there’s a genuine shift in
I ask my question due to I want to use TRA (Time Routed Aliases). Let's say
SOLR will open new collection every month. In the beginning of month a new
collection will be empty almost.
So IDF will be different between new collection and collection of previous
month?
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Both descriptions are correct, but in their context. The description in the Ref
Guide in the section about ExactStatsCache is correct in the sense that it uses
collection-wide IDF values for terms when calculating scores for different
SHARDS (and merging partial per-shard lists). This means that
