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https://issues.apache.org/jira/browse/LUCENE-4560?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13500274#comment-13500274
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Uwe Schindler commented on LUCENE-4560:
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One addition about your testcase extending FilterAtomicReader:
The filter reader there does not filter doc values or stored fields. We
currently have a full-featured FieldFilterAtomicReader
(http://lucene.apache.org/core/4_0_0/test-framework/org/apache/lucene/index/FieldFilterAtomicReader.html)
in the Lucene test-framework, that can take a list of fields to exclude or
include. It is used in some merge tests. My proposal was already to make this
really useful class public.
> Support Filtering Segments During Merge
> ---------------------------------------
>
> Key: LUCENE-4560
> URL: https://issues.apache.org/jira/browse/LUCENE-4560
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Tim Smith
> Attachments: LUCENE-4560.patch
>
>
> Spun off from LUCENE-4557
> It is desirable to be able to filter segments during merge.
> Most often, full reindex of content is not possible.
> Merging segments can sometimes have negative consequences when fields are
> have different options (most restrictive option is forced during merge)
> Being able to filter segments during merges will allow gradually migrating
> indexed data to new index settings, support pruning/enhancing existing data
> gradually
> Use Cases:
> * Migrate IndexOptions for fields (See LUCENE-4557)
> * Gradually Remove index fields no longer used
> * Migrate indexed sort fields to DocValues
> * Support converting data types for indexed data
> * and so on
> patch will be forthcoming
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