json - Elasticsearch Jackson Date type -

i'm using elasticsearch in order create index.
fasty.

i chose jackson in order generate elasticsearch index documents
so, i've created serializer:

public class digitalinputserializer extends jsonserializer<digitalinput> {      @override     public void serialize(digitalinput value, jsongenerator gen,         serializerprovider serializers) throws ioexception,         jsonprocessingexception {          gen.writestartobject();         gen.writenumberfield("timestamp", value.gettimestamp().gettime());   <<<<<<<<<<<<<<<         gen.writestringfield("matter", value.getmatter());         gen.writestringfield("comment", value.getcomment());         gen.writestringfield("channel_id", value.getchannelid());         gen.writeendobject();      }  } 

i've had surprise, when looked writedatefield!!! isn't there!
chose index field using long field, i'm losing date type indexable features elasticsearch provides.

could me, please?

thanks all.