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https://issues.apache.org/jira/browse/LUCENE-8511?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16622786#comment-16622786
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Yonik Seeley commented on LUCENE-8511:
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Looks good, +1 to avoiding getMergedFieldInfos() here!
> MultiFields.getIndexedFields can be optimized to not use getMergedFieldInfos
> ----------------------------------------------------------------------------
>
> Key: LUCENE-8511
> URL: https://issues.apache.org/jira/browse/LUCENE-8511
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: David Smiley
> Assignee: David Smiley
> Priority: Minor
> Attachments: LUCENE-8511.patch, LUCENE-8511.patch
>
>
> MultiFields.getIndexedFields calls getMergedFieldInfos. But
> getMergedFieldInfos is kinda heavy, doing all sorts of stuff that
> getIndexedFields doesn't care about. It can simply loop the leaf readers and
> collect the results into a Set. Java 8 streams should make easy work of this.
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