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https://issues.apache.org/jira/browse/LUCENE-1317?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12608486#action_12608486
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Jason Rutherglen commented on LUCENE-1317:
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Looks like a modified version of addDocument will work, that operates on
TokenStreams and Documents manufactured from the IndexReaders. Can use the
org.apache.lucene.search.highlight.TokenSources for the TokenStreams.
> Add InstantiatedIndexWriter.addIndexes(IndexReader[] readers)
> -------------------------------------------------------------
>
> Key: LUCENE-1317
> URL: https://issues.apache.org/jira/browse/LUCENE-1317
> Project: Lucene - Java
> Issue Type: Improvement
> Components: contrib/*
> Reporter: Jason Rutherglen
>
> Enable InstantiatedIndexWriter to have IndexReaders passed in like
> IndexWriter and merged into the index.
> Karl mentioned:
> bq: It's doable. The simplest solution I can think of is to reconstruct all
> the documents in one single enumeration of the source index and then add them
> to the writer. I'm however not certain this is the best way nor if
> InstantiatedIndexWriter is the place for the code.
> How would the documents be reconstructed without creating a lot of overhead?
> It seems like InstantiatedIndexWriter is the right place, given it is
> presumably more efficient to recreate all the IndexReaders and then commit?
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