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https://issues.apache.org/jira/browse/LUCENE-7500?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15582426#comment-15582426
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Adrien Grand commented on LUCENE-7500:
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I just looked again at how Fields are used, and I'd be tempted to just remove
{{LeafReader.fields()}}. Consumers would have to call
{{LeafReader.terms(String)}} instead. Fields would still be useful in
{{CodecReader.getPostingsReader()}} (consistently with {{getNormsReader}},
{{getPointsReader}}, {{getDocValuesReader}} which all deal with all fields at
once) and {{LeafReader.getTermVectors(int)}} for term vectors.
> Nuke Fields.java in lieu of LeafReader.getTerms(fieldName)
> ----------------------------------------------------------
>
> Key: LUCENE-7500
> URL: https://issues.apache.org/jira/browse/LUCENE-7500
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: David Smiley
> Fix For: master (7.0)
>
>
> {{Fields}} seems like a pointless intermediary between the {{LeafReader}} and
> {{Terms}}. Why not have {{LeafReader.getTerms(fieldName)}} instead? One loses
> the ability to get the count and iterate over indexed fields, but it's not
> clear what real use-cases are for that and such rare needs could figure that
> out with FieldInfos.
> [~mikemccand] pointed out that we'd probably need to re-introduce a
> {{TermVectors}} class since TV's are row-oriented not column-oriented. IMO
> they should be column-oriented but that'd be a separate issue.
> _(p.s. I'm lacking time to do this w/i the next couple months so if someone
> else wants to tackle it then great)_
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