arangosh> db.example.insert({ Hello : "World" });
{ 
  "_id" : "example/475472949", 
  "_rev" : "475472949", 
  "_key" : "475472949" 
}
arangosh> db.example.insert({ Hello : "World" }, true);
{ 
  "_id" : "example/475669557", 
  "_rev" : "475669557", 
  "_key" : "475669557" 
}