SOLR-8559: FCS facet performance optimization
Significantly speeds up processing when terms are high cardinality and the matching docset is small.
When facet minCount > 0 and the number of matching documents is small (or 0) this enhancement
prevents considering terms which have a 0 count. Also includes change to move to the next non-zero
term value when selecting a segment position.
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lucene/dev/branches/branch_5x/solr/CHANGES.txt