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https://issues.apache.org/jira/browse/LUCENE-4087?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13291600#comment-13291600
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Simon Willnauer commented on LUCENE-4087:
-----------------------------------------
After talking about this to other committers during the conference I think this
is really a bit more controversial than it seemed. Except of the DocValues
behavior this all is pre-existing behavior. The discussion is similar to
changing norms through IR and removing that capability did bring up some hard
discussions. Yet, I think we should only solve the DocValues issue in the least
intrusive way and discuss the omitNorms & IndexOptions behavior in a different
issue. If we make all this throwing exceptions we almost introduce a schema
here which makes lucene 4.0 very different in terms of RT behavior compared to
previous versions.
> Provide consistent IW behavior for illegal meta data changes
> ------------------------------------------------------------
>
> Key: LUCENE-4087
> URL: https://issues.apache.org/jira/browse/LUCENE-4087
> Project: Lucene - Java
> Issue Type: Improvement
> Components: core/index
> Affects Versions: 4.0
> Reporter: Simon Willnauer
> Fix For: 4.0, 4.1, 5.0
>
>
> Currently IW fails late and inconsistent if field metadata like an already
> defined DocValues type or "un"-omitting norms.
> we can approach this similar to how we handle consistent field number and:
>
> * throw exception if indexOptions conflict (e.g. omitTF=true versus
> false) instead of silently dropping positions on merge
> * same with omitNorms
> * same with norms types and docvalues types
> * still keeping field numbers consistent
> this way we could eliminate all these traps and just give an
> exception instead.
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