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https://issues.apache.org/jira/browse/LUCENE-4258?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13423055#comment-13423055
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Robert Muir commented on LUCENE-4258:
-------------------------------------

A few things I dont understand:
* when updating a document, how do you know which terms to apply negative 
postings to?
* how can the idea of updating "individual terms" work as far as length 
normalization information? How will that be reconciled?

In truth I think term is too fine-grained of a level for updates in lucene 
because of norms, 
only updating whole fields of a document will really work (as then the norm can 
simply be recomputed and replaced). 


                
> Incremental Field Updates through Stacked Segments
> --------------------------------------------------
>
>                 Key: LUCENE-4258
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4258
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/index
>            Reporter: Sivan Yogev
>   Original Estimate: 2,520h
>  Remaining Estimate: 2,520h
>
> Shai and I would like to start working on the proposal to Incremental Field 
> Updates outlined here (http://markmail.org/message/zhrdxxpfk6qvdaex).

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