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https://issues.apache.org/jira/browse/LUCENE-7453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15509437#comment-15509437
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Michael McCandless commented on LUCENE-7453:
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+1 for {{docIndex}}!
> Change naming of variables/apis from docid to docnum
> ----------------------------------------------------
>
> Key: LUCENE-7453
> URL: https://issues.apache.org/jira/browse/LUCENE-7453
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Ryan Ernst
>
> In SOLR-9528 a suggestion was made to change {{docid}} to {{docnum}}. The
> reasoning for this is most notably that {{docid}} has a connotation about a
> persistent unique identifier (eg like {{_id}} in elasticsearch or {{id}} in
> solr), while {{docid}} in lucene is currently some local to a segment, and
> not comparable directly across segments.
> When I first started working on Lucene, I had this same confusion. {{docnum}}
> is a much better name for this transient, segment local identifier for a doc.
> Regardless of what solr wants to do in their api (eg keeping _docid_), I
> think we should switch the lucene apis and variable names to use docnum.
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