arangosh> db.example.insert({ Hello : "World" });
{ 
  "error" : false, 
  "_id" : "example/1019962838", 
  "_rev" : "1019962838", 
  "_key" : "1019962838" 
}
arangosh> db.example.insert({ Hello : "World" }, true);
{ 
  "error" : false, 
  "_id" : "example/1020159446", 
  "_rev" : "1020159446", 
  "_key" : "1020159446" 
}