arangosh> db.names.ensureIndex({ type: "skiplist", fields: [ "first" ] }); { "deduplicate" : true, "fields" : [ "first" ], "id" : "names/73871", "isNewlyCreated" : true, "name" : "idx_1641835679859081218", "selectivityEstimate" : 1, "sparse" : false, "type" : "skiplist", "unique" : false, "code" : 201 } arangosh> db.names.save({ "first" : "Tim" }); { "_id" : "names/73875", "_key" : "73875", "_rev" : "_ZG8Lmbm---" } arangosh> db.names.save({ "first" : "Tom" }); { "_id" : "names/73877", "_key" : "73877", "_rev" : "_ZG8Lmbm--A" } arangosh> db.names.save({ "first" : "John" }); { "_id" : "names/73879", "_key" : "73879", "_rev" : "_ZG8Lmbq---" } arangosh> db.names.save({ "first" : "Tim" }); { "_id" : "names/73881", "_key" : "73881", "_rev" : "_ZG8Lmbq--A" } arangosh> db.names.save({ "first" : "Tom" }); { "_id" : "names/73883", "_key" : "73883", "_rev" : "_ZG8Lmbu---" }