arangosh> db.names.ensureIndex({ type: "skiplist", fields: [ "first" ] }); { "deduplicate" : true, "fields" : [ "first" ], "id" : "names/16265", "isNewlyCreated" : true, "sparse" : false, "type" : "skiplist", "unique" : false, "code" : 201 } arangosh> db.names.save({ "first" : "Tim" }); { "_id" : "names/16268", "_key" : "16268", "_rev" : "_XiAwVB---_" } arangosh> db.names.save({ "first" : "Tom" }); { "_id" : "names/16272", "_key" : "16272", "_rev" : "_XiAwVB---B" } arangosh> db.names.save({ "first" : "John" }); { "_id" : "names/16275", "_key" : "16275", "_rev" : "_XiAwVBC--_" } arangosh> db.names.save({ "first" : "Tim" }); { "_id" : "names/16278", "_key" : "16278", "_rev" : "_XiAwVBC--B" } arangosh> db.names.save({ "first" : "Tom" }); { "_id" : "names/16281", "_key" : "16281", "_rev" : "_XiAwVBC--D" }