Rob Audenaerde created LUCENE-5476:
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             Summary: Facet sampling
                 Key: LUCENE-5476
                 URL: https://issues.apache.org/jira/browse/LUCENE-5476
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Rob Audenaerde


With LUCENE-5339 facet sampling disappeared. 

When trying to display facet counts on large datasets (>10M documents) counting 
facets is rather expensive, as all the hits are collected and processed. 

Sampling greatly reduced this and thus provided a nice speedup. Could it be 
brought back?



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