Lucene:
New features include: FreeTextSuggester (Lucene-5214), New Document Dictionary (Lucene-5221), and twenty-one (21) others!
Solr:
New features include: support for AnalyzingInfixSuggester (Solr-5167), new field type EnumField (Solr-5084), and fifteen (15) others!
Not that I will know anytime soon but I am curious how well the AnalyzingInfixSuggester would work with Akkadian.