[ENG-2322] Activate dynamic mapper.
[ENG-2322] Activate dynamic mapper.

paul-e-cooley/elasticsearch-jetty,whitefoxx/elasticsearch-jetty,whitefoxx/elasticsearch-jetty,tmayfield/elasticsearch-jetty,sonian/elasticsearch-jetty,paul-e-cooley/elasticsearch-jetty,JoeyJiao/elasticsearch-jetty,sonian/elasticsearch-jetty,JoeyJiao/elasticsearch-jetty,tmayfield/elasticsearch-jetty