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https://issues.apache.org/jira/browse/LUCENE-4560?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13500311#comment-13500311
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Uwe Schindler commented on LUCENE-4560:
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bq. this filtering merge reader approach also fulfills other requirements i
have for migrating old indexed content to use new features so it would be a
win-win for me to use this filtered merge reader approach to ensure consistency
and conformance with my schema.
I just have to repeat myself: We dont need to modify Lucene to make this
"migration" work! See my last comment, it lists the whole workflow to do this
"merge" on the directory index without the need for temporary index instances,
completely on-the-fly. Your testcase can be rewritten to exactly do what you
want without any custom merge policy / SegmentMerger stuff.
> 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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