Grouping / Field Collapsing A new, automaton-based suggest/autocomplete implementation offering an order of magnitude smal ler RAM consumption. KStemFilterFactory, an optimized implementation of a less aggressive stemmer for English. Solr defaults to a new, more efficient merge policy (TieredMergePolicy). See HTTP://s.apache.org/merging for more information. Important bugfixes, including extremely high RAM usage in spellchecking. Bugfixes and improvements from Apache Lucene 3.3