arangosh> db.names.ensureIndex({ type: "persistent", fields: [ "first" ] }); { "id" : "names/16005", "type" : "persistent", "fields" : [ "first" ], "unique" : false, "sparse" : false, "isNewlyCreated" : true, "code" : 201 } arangosh> db.names.save({ "first" : "Tim" }); { "_id" : "names/16008", "_key" : "16008", "_rev" : "16008" } arangosh> db.names.save({ "first" : "Tom" }); { "_id" : "names/16012", "_key" : "16012", "_rev" : "16012" } arangosh> db.names.save({ "first" : "John" }); { "_id" : "names/16015", "_key" : "16015", "_rev" : "16015" } arangosh> db.names.save({ "first" : "Tim" }); { "_id" : "names/16018", "_key" : "16018", "_rev" : "16018" } arangosh> db.names.save({ "first" : "Tom" }); { "_id" : "names/16021", "_key" : "16021", "_rev" : "16021" }