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https://issues.apache.org/jira/browse/SOLR-11733?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16553149#comment-16553149
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Hoss Man commented on SOLR-11733:
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Linking SOLR-12343 where overrefine was added
> add an option make json.facet refinement more "optimistic" like
> facet.field/facet.pivot so that long tail have a change to bubble up
> ------------------------------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-11733
> URL: https://issues.apache.org/jira/browse/SOLR-11733
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Facet Module
> Reporter: Hoss Man
> Priority: Major
>
> {{json.facet}} refinement is currently "pessimistic" by default.
> Specifically: "Long Tail" terms that may not be in the "top n" on every
> shard, but are in the "top n + overrequest" for at least 1 shard aren't
> getting refined and included in the aggregated response in some cases.
> This is different then the "optimistic" approach taken in the existing
> {{facet.field}} and {{facet.pivot}} refinement, that refines all known terms
> whose counts *might* be high enough to put them in the topN based on what's
> known about the lowest count returned by each shard in phase #1.
> A mitigating option that people with particular concerns about long tail
> terms can consider is to set a "high" value for the {{overrefine}} parameter
> -- forcing Solr to refine more terms from phase#1 -- but this is somewhat of
> a "brute force" workaround, since it doesn't take into account any known info
> about the results of each shard from phase#1.
> This issue tracks possible improvements that could be made to the faceting
> code to be more sophisticated.
>
> ----
> (NOTE: this Jira was originally filed as a bug report noting that
> {{json.facet}} refinement didn't seem to be working properly compared to
> facet.field refinement, and early comments are written in this mindset)
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