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https://issues.apache.org/jira/browse/LUCENE-5298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13812459#comment-13812459
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Robert Muir commented on LUCENE-5298:
-------------------------------------
yes, exactly. because of where the abstract API is (mis)placed there are many
unnecessary and confusing dependencies. we should eliminate the suggest/
dependencies on expressions and queries, the expressions/ on queries, the
grouping/ dependency on queries, the spatial/ dependency on queries, its a mess.
> Allow aggregating facets by any ValueSource
> -------------------------------------------
>
> Key: LUCENE-5298
> URL: https://issues.apache.org/jira/browse/LUCENE-5298
> Project: Lucene - Core
> Issue Type: New Feature
> Components: modules/facet
> Reporter: Shai Erera
> Attachments: LUCENE-5298.patch, LUCENE-5298.patch
>
>
> Facets can be aggregated today by counting them, aggregating by summing their
> association values, or summing the scores of the documents. Applications can
> write their own FacetsAggregator to compute the value of the facet in other
> ways. Following the new expressions module, I think it will be interesting to
> allow aggregating facets by arbitrary expressions, e.g. {{_score *
> sqrt(price)}} where 'price' is an NDV field. I'd like to explore allowing any
> ValueSource to be passed in and write a ValueSourceFacetsAggregator.
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