mywebsite/mongodb/dump/admin/system.users.metadata.json

{ "indexes" : [ { "v" : 1, "key" : { "_id" : 1 }, "name" : "_id_", "ns" : "admin.system.users" }, { "v" : 1, "unique" : true, "key" : { "user" : 1, "db" : 1 }, "name" : "user_1_db_1", "ns" : "admin.system.users" } ] }