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https://issues.apache.org/jira/browse/LUCENE-5215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13767921#comment-13767921
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Robert Muir commented on LUCENE-5215:
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No, they dont take this and for damn good reason: SRS/SWS contain fieldinfos.
> Add support for FieldInfos generation
> -------------------------------------
>
> Key: LUCENE-5215
> URL: https://issues.apache.org/jira/browse/LUCENE-5215
> Project: Lucene - Core
> Issue Type: New Feature
> Components: core/index
> Reporter: Shai Erera
> Assignee: Shai Erera
>
> In LUCENE-5189 we've identified few reasons to do that:
> # If you want to update docs' values of field 'foo', where 'foo' exists in
> the index, but not in a specific segment (sparse DV), we cannot allow that
> and have to throw a late UOE. If we could rewrite FieldInfos (with
> generation), this would be possible since we'd also write a new generation of
> FIS.
> # When we apply NDV updates, we call DVF.fieldsConsumer. Currently the
> consumer isn't allowed to change FI.attributes because we cannot modify the
> existing FIS. This is implicit however, and we silently ignore any modified
> attributes. FieldInfos.gen will allow that too.
> The idea is to add to SIPC fieldInfosGen, add to each FieldInfo a dvGen and
> add support for FIS generation in FieldInfosFormat, SegReader etc., like we
> now do for DocValues. I'll work on a patch.
> Also on LUCENE-5189, Rob raised a concern about SegmentInfo.attributes that
> have same limitation -- if a Codec modifies them, they are silently being
> ignored, since we don't gen the .si files. I think we can easily solve that
> by recording SI.attributes in SegmentInfos, so they are recorded per-commit.
> But I think it should be handled in a separate issue.
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