ruby - Why can't I see TTL from db.my_collection.getIndex() output? -

i have index expireafterseconds set. how confirm using cli when output of db.my_collection.getindexes() shows this:

{   "v": 1,   "key": {     "last_used_at": 1   },   "name": "last_used_at_1",   "ns": "cms.user_sessions" } 

it looks normal index without expireafterseconds set.

how can confirm index created expireafterseconds?

---

here's ruby code creates index. have tried dropping index , recreating using code several times.

@user_sessions.indexes.create_many([   {key: {token: 1}, unique: true},   {key: {last_used_at: 1}, expireafterseconds: ttl} ]) 

version information:

 $ mongod --version db version v2.6.5 2016-07-13t16:11:45.844+0200 git version: e99d4fcb4279c0279796f237aa92fe3b64560bf6  $ gem list | grep mongo mongo (2.2.5) 

there issue index, try drop , recreate.

when ttl set db.name.getindexes() command

[     {         "v" : 1,         "key" : {             "_id" : 1         },         "name" : "_id_",         "ns" : "test.eventlog"     },     {         "v" : 1,         "key" : {             "lastmodifieddate" : 1.0         },         "name" : "lastmodifieddate_1",         "ns" : "test.eventlog",         "expireafterseconds" : 3600.0     } ]