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https://issues.apache.org/jira/browse/LUCENE-4560?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13498087#comment-13498087
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Tim Smith edited comment on LUCENE-4560 at 11/15/12 4:03 PM:
-------------------------------------------------------------
Attaching patch
patch adds MergedSegmentFilter base class and adds config setter akin to
IndexReaderWarmer on IndexWriterConfig (by all means, suggest better names)
SegmentMerger will use this (if specified) to filter any segments being merged
Test case included that uses filter to remove an indexed field during merge.
was (Author: tsmith):
Attaching patch
patch adds MergeSegmentFilter base class and adds config setter akin to
IndexReaderWarmer on IndexWriterConfig (by all means, suggest better names)
SegmentMerger will use this (if specified) to filter any segments being merged
Test case included that uses filter to remove an indexed field during merge.
> 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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