Tim Smith created LUCENE-4560:
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Summary: 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
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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