Ryan Ernst created LUCENE-7453:

             Summary: 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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