Michael McCandless created LUCENE-7282:
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Summary: search APIs should take advantage of index sort by default
Key: LUCENE-7282
URL: https://issues.apache.org/jira/browse/LUCENE-7282
Project: Lucene - Core
Issue Type: Improvement
Reporter: Michael McCandless
Spinoff from LUCENE-6766, where we made it very easy to have Lucene sort
documents in the index (at merge time).
An index-time sort is powerful because if you then search that index by the
same sort (or by a "prefix" of it), you can early-terminate per segment once
you've collected enough hits. But doing this by default would mean accepting
an approximate hit count, and could not be used in cases that need to see every
hit, e.g. if you are also faceting.
Separately, `TermQuery` on the leading sort field can be very fast since we can
advance to the first docID, and only match to the last docID for the requested
value. This would not be approximate, and should be lower risk / easier.
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