Add index upgrade method to IndexWriter to force an upgrade of all segments to
last recent supported index format without optimizing
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Key: LUCENE-3082
URL: https://issues.apache.org/jira/browse/LUCENE-3082
Project: Lucene - Java
Issue Type: New Feature
Components: Index
Reporter: Uwe Schindler
Priority: Minor
Fix For: 3.2, 4.0
Currently if you want to upgrade an old index to the format of your current
Lucene version, you have to optimize your index or use
addIndexes(IndexReader...) [see LUCENE-2893] to copy to a new directory. The
optimize() approach fails if your index is already optimized.
I propose to add a method to IndexWriter thats similar to optimize(), that uses
a custom MergePolicy to upgrade all segments to the last format. This
MergePolicy could simply also ignore all segments already up-to-date. All
segments in prior formats would be merged to a new segment. The tool could
optionally also optimize the index.
This issue is different from LUCENE-2893, as it would only support upgrading
indexes from previous Lucene versions in-place using the official path. Its a
tool for the end user, not a developer tool.
This addition should also go to Lucene 3.x, as we need to make users with
pre-3.0 indexes go the step through 3.x, else they would not be able to open
their index with 4.0. With this tool in 3.x the users could safely upgrade
their index without relying on optimize to work on already-optimized indexes.
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