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https://issues.apache.org/jira/browse/LUCENE-3828?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13217324#comment-13217324
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Yonik Seeley commented on LUCENE-3828:
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bq. The problem is IndexWriter executes query deletes per segment
(unfortunately with AtomicReaderContext.docBase==0).
Ahhhh, so no way to get a true top-level reader for anything that needs to be
cross-segment (like joins, grouping, etc.) Bummer.
> Impossible to delete doc by docId, undeleteAll or setNorm(docId..)
> ------------------------------------------------------------------
>
> Key: LUCENE-3828
> URL: https://issues.apache.org/jira/browse/LUCENE-3828
> Project: Lucene - Java
> Issue Type: Bug
> Components: core/index
> Affects Versions: 4.0
> Reporter: Andrzej Bialecki
>
> It appears that there is a major regression in the trunk API. It's no longer
> possible to:
> 1. delete document by internal id (even though you can iterate and retrieve
> docs by internal ids)
> 2. undelete all deleted (but not yet reclaimed) documents
> 3. set norm value on a specific document (by internal id)
> The lack of #1 means that you have to use delete by term or by query, which
> in turn means that now we require that documents have a unique primary key
> (otherwise you won't be able to delete a particular document that shares
> terms with other docs). IMHO this item is critical and should be fixed.
> The lack of #2 might not be critical but it still comes handy in some
> situations.
> The lack of #3 means that you have to update the whole doc if you just want
> to correct one field, which might be ok for the time being - it's a special
> case of not having updateable fields in general. But it's quite inconvenient
> if all you want to do is to adjust a weight of doc without reindexing,
> something that is possible with 3.x.
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