arangosh> db.example.insert({ a:  1 } );
{ 
  "error" : false, 
  "_id" : "example/979789250", 
  "_rev" : "979789250", 
  "_key" : "979789250" 
}
arangosh> db.example.remove("example/11265325374", {overwrite: true, waitForSync: false})
false