We can also view logs of each service separately. The following are the logs for Concierge:

$ docker-compose logs concierge
Attaching to goophr_concierge_1
concierge_1         | 2018/01/21 19:18:30 INFO -  Adding API handlers...
concierge_1         | 2018/01/21 19:18:30 INFO -  Starting feeder...
concierge_1         | 2018/01/21 19:18:30 INFO -  Starting Goophr Concierge server on port :9090...
concierge_1         | 2018/01/21 19:21:02 INFO -  Adding API handlers...
concierge_1         | 2018/01/21 19:21:02 INFO -  Starting feeder...
concierge_1         | 2018/01/21 19:21:02 INFO -  Starting Goophr Concierge server on port :9090...
concierge_1         | adding to librarian: zebra
concierge_1         | adding to librarian: apple
concierge_1         | adding to librarian: apple
concierge_1         | adding to librarian: cat
concierge_1         | 2018/01/21 19:25:40 INFO -  Request was posted to Librairan. Msg:{"code": 200, "msg": "Tokens are being added to index."}
concierge_1         | 2018/01/21 20:31:06 http://a_m_librarian:6060/api -> api.queryResult{Count:3, Data:[]api.docs{api.docs{DocID:"3c9c56d31ccd51bc7ac0011020819ef38ccd74a4", Score:3}, api.docs{DocID:"7bded23abfac73630d247b6ad24370214fe1811c", Score:2}, api.docs{DocID:"28582e23c02ed3f14f8b4bdae97f91106273c0fc", Score:1}}}
concierge_1         | 2018/01/21 20:31:06 http://n_z_librarian:7070/api -> api.queryResult{Count:0, Data:[]api.docs{}}
concierge_1         | 2018/01/21 20:31:06 ---------------------------
concierge_1         | 2018/01/21 20:31:06 WARN: http://others_librarian:8080/api -> Post http://others_librarian:8080/api/query: http: ContentLength=16 with Body length 0
concierge_1         | 2018/01/21 20:31:06 ---------------------------
concierge_1         | []api.document{api.document{Doc:"apple cake cake whale", Title:"Book 3", DocID:"3c9c56d31ccd51bc7ac0011020819ef38ccd74a4", URL:"http://file_server:9876/book3"}, api.document{Doc:"apple apple cat zebra", Title:"Book 1", DocID:"7bded23abfac73630d247b6ad24370214fe1811c", URL:"http://file_server:9876/book1"}, api.document{Doc:"banana cake zebra", Title:"Book 2", DocID:"28582e23c02ed3f14f8b4bdae97f91106273c0fc", URL:"http://file_server:9876/book2"}}