public static HistoryEvent createMerged(long timestamp,Recordable recordable,String referrer,long mergedId){
  return new RecordableHistoryEvent(MERGED_TYPE,timestamp,recordable,referrer,String.format("merged [%d]",mergedId),ImmutableMap.of(PARAM_MERGED_ID,Long.toString(mergedId)));
}

public static HistoryEvent createMerged ( long timestamp , Recordable recordable , String referrer , long mergedId ) { return new RecordableHistoryEvent ( MERGED_TYPE , timestamp , recordable , referrer , String . format ( "merged [%d]" , mergedId ) , ImmutableMap . of ( PARAM_MERGED_ID , Long . toString ( mergedId ) ) ) ; }
create a history event which represents a merge .
