CODEWITHSUNDEEP
elasticsearch
GlurG
GlurG

Reputation: 237

Disable IDF calculation

In my particular use case, the IDF-factor that gets calculated as part of the TF-IDF algorithm messes up the scoring for my queries. Basically, I want the queries to only take the term frequency into account. Is it possible to disable the IDF factor, i.e set it to 1, for a particular index? I have looked into the similarity module (in version 0.90.X), but haven't really found anything that could help; same goes for the function_score query. Do I need to write a custom Similarity class in java? Or is there a plugin for what I'm trying to achieve?

Upvotes: 11

Views: 3486

Answers (1)

Thomas Decaux
Thomas Decaux

Reputation: 22671

What about constant_score query?

See http://www.elasticsearch.org/guide/en/elasticsearch/guide/current/ignoring-tfidf.html

Don't hesitate to use ?explain=true to see how scoring is working.

As you can here without constant_filter:

With IDF

And with constant_filter query (that wraps your real query):

Without IDF

Upvotes: 1

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