arangosh> db.test.ensureHashIndex("hashListAttribute", ........> "hashListSecondAttribute.subAttribute"); { "id" : "test/15327", "type" : "hash", "fields" : [ "hashListAttribute", "hashListSecondAttribute.subAttribute" ], "selectivityEstimate" : 1, "unique" : false, "sparse" : false, "isNewlyCreated" : true, "code" : 201 } arangosh> db.test.getIndexes(); [ { "id" : "test/0", "type" : "primary", "fields" : [ "_key" ], "selectivityEstimate" : 1, "unique" : true, "sparse" : false }, { "id" : "test/15321", "type" : "skiplist", "fields" : [ "skiplistAttribute" ], "unique" : true, "sparse" : false }, { "id" : "test/15324", "type" : "skiplist", "fields" : [ "skiplistUniqueAttribute" ], "unique" : true, "sparse" : false }, { "id" : "test/15327", "type" : "hash", "fields" : [ "hashListAttribute", "hashListSecondAttribute.subAttribute" ], "selectivityEstimate" : 1, "unique" : false, "sparse" : false } ]