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https://issues.apache.org/jira/browse/SOLR-7830?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17508772#comment-17508772
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Tim Owen commented on SOLR-7830:
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There's 2 ways to invoke this, hence 2 kinds of parser in that code: the
function syntax one (which is supported whether it's in solr core or a plugin)
and the json approach (which only works if the code is built into solr, because
it hooks into the json facet parsing). So I just meant that if you're using
this via a plugin, you have to use the function syntax.
There's an example of this json alternative in Yonik's first comment in this
ticket, where he has a facet with type:topdocs and the parameters written in
json. As his comment says "This is the first facet function / aggregation that
supports JSON rather than just function query notation" but that's only true if
the patch is in solr core - we lose that ability if it's a plugin because
there's no way to hook custom code into the json parsing (so far).
So for use in a plugin, you just have to write it function style i.e.
"sampledocument":"topdocs(...)"
p.s. I mistakenly said I'd built this against 8.6.2 but actually that should be
8.8 which is when the changes to allow plugins to do custom aggregates was
actually available.
> topdocs facet function
> ----------------------
>
> Key: SOLR-7830
> URL: https://issues.apache.org/jira/browse/SOLR-7830
> Project: Solr
> Issue Type: New Feature
> Components: Facet Module
> Reporter: Yonik Seeley
> Priority: Major
> Attachments: ALT-SOLR-7830.patch, SOLR-7830.patch, SOLR-7830.patch,
> TopDocsAgg.java
>
>
> A topdocs() facet function would return the top N documents per facet bucket.
> This would be a big step toward unifying grouping and the new facet module.
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