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https://issues.apache.org/jira/browse/LUCENE-4560?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13500267#comment-13500267
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Shai Erera commented on LUCENE-4560:
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bq. Small config changes shouldn't require the equivalent of a full optimize to
take effect.
I wouldn't call these "small config changes" :). And if you give your users the
possibility to randomly decide to turn off tracking offsets ... well then
either your users are all Lucene highly-involved committers/users, or you're
putting too much power in their hands.
I also can't tell, in your world - it's definitely not common in mines, how
often will such a configuration be changed. Removing fields no longer needed -
that's one thing. Changing IndexOptions, that's a totally different thing.
bq. Also, i argue that any addIndexes() approach is even more dangerous and
just as prone to corruption
Right, but because of how addIndexes works, you get the chance to review the
result index before you choose to publish it. If anything is not entirely as
expected, you discard the operation, fix the code, start over. The source index
remains intact.
> 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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