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https://issues.apache.org/jira/browse/SOLR-6319?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14085406#comment-14085406
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Yonik Seeley commented on SOLR-6319:
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It's not clear to me if you've hit something new, or something that has already
been considered/documented.
Here's the current comments for reference:
{code}
// we're sorting by index order.
// if minCount==0, we should always be able to get accurate results
w/o over-requesting or refining
// if minCount==1, we should be able to get accurate results w/o
over-requesting, but we'll need to refine
// if minCount==n (>1), we can set the initialMincount to
minCount/nShards, rounded up.
// For example, we know that if minCount=10 and we have 3 shards,
then at least one shard must have a count of 4 for the term
// For the minCount>1 case, we can generate too short of a list
(miss terms at the end of the list) unless limit==-1
// For example: each shard could produce a list of top 10, but some
of those could fail to make it into the combined list (i.e.
// we needed to go beyond the top 10 to generate the top 10
combined). Overrequesting can help a little here, but not as
// much as when sorting by count.
{code}
It's been years since I wrote that, but IIRC the thinking was that over
requesting when sorting by index was probably not worth it. It's a judgement
call, and shouldn't be categorized as a bug (if I'm understanding this issue
correctly).
> if mincount > 1, facet.field needs to overrequest even if facet.sort=index
> --------------------------------------------------------------------------
>
> Key: SOLR-6319
> URL: https://issues.apache.org/jira/browse/SOLR-6319
> Project: Solr
> Issue Type: Bug
> Reporter: Hoss Man
> Assignee: Hoss Man
>
> Discovered this while working on SOLR-2894. the logic for distributed
> faceting ignores over requesting (beyond the user specified facet.limit) if
> the facet.sort is index order -- but the rationale for doing this falls apart
> if the user has specified a facet.mincount > 1
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