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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4560) Support Filtering Segments During Merge
Date Mon, 19 Nov 2012 15:18:58 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4560?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13500296#comment-13500296
] 

Robert Muir commented on LUCENE-4560:
-------------------------------------

Then it sounds like in your world, where you don't know how text should be indexed, you shouldn't
use such advanced options.

Instead maybe you should index in a generic way, e.g. using the classic highlighting techniques.
These index options are ways to customize what information the index should retain in situations
where you know this.

There is no migration strategy at all if you choose the wrong options: you threw that information
away, so you need to re-index.
                
> 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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