arangosh> db.names.ensureIndex({ type: "skiplist", fields: [ "first" ] }); { "deduplicate" : true, "fields" : [ "first" ], "id" : "names/17990", "isNewlyCreated" : true, "sparse" : false, "type" : "skiplist", "unique" : false, "code" : 201 } arangosh> db.names.save({ "first" : "Tim" }); { "_id" : "names/17993", "_key" : "17993", "_rev" : "_WBDpDja--_" } arangosh> db.names.save({ "first" : "Tom" }); { "_id" : "names/17997", "_key" : "17997", "_rev" : "_WBDpDja--B" } arangosh> db.names.save({ "first" : "John" }); { "_id" : "names/18000", "_key" : "18000", "_rev" : "_WBDpDje--_" } arangosh> db.names.save({ "first" : "Tim" }); { "_id" : "names/18003", "_key" : "18003", "_rev" : "_WBDpDje--B" } arangosh> db.names.save({ "first" : "Tom" }); { "_id" : "names/18006", "_key" : "18006", "_rev" : "_WBDpDji--_" }