[SOLR-9851] Introduce Interesting Terms Json Facet

• Type: New Feature
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: Facet Module, faceting
• Assignee: Unassigned
• Reporter: Alessandro Benedetti
• Created: 12/Dec/16 10:51
• Updated: 08/Jun/19 15:29

Description

After playing a bit with the Lucene MLT I noticed a couple of methods were there for calculating the interesting terms ( from the seed document) .

I think this can be extended to a supported calculation on the search results.
Specifically I am thinking to initially add a new type of Json Facet ( InterestingTerms).

This new aggregation will calculate the interesting terms from the search results given :

• a field
• a minCount ( we ignore the score calculus for terms occurring less than this threshold in the search results)
• possibly all the other supported params for faceting

Naive Implementation :
Score for each term can be calculated as :
count * IDF

Observations
Taking a look around the web, I see that a similar type of aggregation has already been included in Elastic Search time ago ( see nice blog from Mark at https://www.elastic.co/blog/significant-terms-aggregation )

Any reason we don't have anything similar yet ?

I will provide better design and more information soon.