search - Lucene Faceting : what are the limitations of Taxonomy and SortedSetDocValuesFacetField compared to solr and es implementations? -


we know lucene supports faceting providing taxonomy(separate index , hierarchical facets) , sortedsetdocvaluesfacetfield ( flat facets , no sidecar index).

then why did solr , elastic search go own implementation ? ( is, solr uses block join & elasticsearch uses aggregations ) there limitations in lucene's implementation ?


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