arangosh> db.example.insert({ Hello : "World" });
{ 
  "_id" : "example/1154282379", 
  "_rev" : "1154282379", 
  "_key" : "1154282379" 
}
arangosh> db.example.insert({ Hello : "World" }, true);
{ 
  "_id" : "example/1154478987", 
  "_rev" : "1154478987", 
  "_key" : "1154478987" 
}