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https://issues.apache.org/jira/browse/LUCENE-4560?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13500291#comment-13500291
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Tim Smith commented on LUCENE-4560:
-----------------------------------
bq. Its been this way since even 2.x, if you omitTF, then later decide you want
TF and positions, you need to re-index.
re-index is the key word here
re-indexing is not something that can always be done, or implies a massive cost.
changing a schema setting for one field should not require a full re-index.
i'm afraid i'm in a world where re-index is a 4 letter word and should only be
done in the most extreme of circumstances.
my whole point here is that migration should be possible via a pluggable policy
bq. Thats why these are expert options.
i know these are expert options, but there should also be a means to support
migration to new settings (albeit an expert means to do so that may have some
consequences for how old documents were indexed)
> 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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