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https://issues.apache.org/jira/browse/LUCENE-7283?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15558656#comment-15558656
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Yonik Seeley commented on LUCENE-7283:
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bq. In ancient Lucene versions, sorting was not a "first class citizen" and
hacks like field cache were necessary.
Yes, a hack that has been with us for more than *12 years* already (FieldCache
came about in 2004).
Best practice is one thing (Solr uses docvalues by default), but removing the
option is different.
After a quick google, it doesn't appear like you're removing this ability from
elasticsearch (fielddata is the ES equivalent of the Lucene FieldCache):
https://www.elastic.co/guide/en/elasticsearch/reference/5.x/modules-fielddata.html
https://www.elastic.co/guide/en/elasticsearch/reference/current/fielddata.html
> Move SlowCompositeReaderWrapper and uninverting package to solr sources
> -----------------------------------------------------------------------
>
> Key: LUCENE-7283
> URL: https://issues.apache.org/jira/browse/LUCENE-7283
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 6.1, master (7.0)
>
> Attachments: LUCENE-7283.patch
>
>
> Spinoff from LUCENE-6766, where we fixed index-time sorting to have first
> class support in Lucene's ore, and no longer use
> {{SlowCompositeReaderWrapper}}.
> This is a dangerous, long living class, that tries to pretend a set of N
> segments is actually just a single segment. It's a leaky abstraction, has
> poor performance, and puts undue pressure on the APIs of new Lucene features
> to try to keep up this illusion.
> With LUCENE-6766, finally all usage of this class (except for
> {{UninvertedReader}} tests, which should maybe also move out?) has been
> removed from Lucene, so I think we should move it to Solr. This may also
> lead to a solution for LUCENE-7086 since e.g. the class could tap into solr's
> schema to "know" how to handle points fields properly.
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