https://solr.apache.org/docs/5_3_0/solr-core/org/apache/solr/search/facet/SlotAcc.html
SlotAcc (Solr 5.3.0 API)
solrapi
https://solr.apache.org/docs/10_0_0/core/org/apache/solr/search/facet/SlotAcc.LongFuncSlotAcc.html
SlotAcc.LongFuncSlotAcc (Solr 10.0.0 core API)
declaration: package: org.apache.solr.search.facet, class: SlotAcc, class: LongFuncSlotAcc
solrcoreapi