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From "Tim Smith (JIRA)" <>
Subject [jira] [Created] (LUCENE-4560) Support Filtering Segments During Merge
Date Thu, 15 Nov 2012 15:38:11 GMT
Tim Smith created LUCENE-4560:

             Summary: Support Filtering Segments During Merge
                 Key: LUCENE-4560
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Tim Smith

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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