Ubuntu 15.04: Elasticsearch service doesn’t start

I followed the first part from the tutorial here to install Elasticsearch. I didn't install java because I already have that installed with other java programs running.

sudo service elasticsearch restart

Doesn't output anything.

sudo service elasticsearch status

Outputs the following:

● elasticsearch.service – Starts and stops a single elasticsearch
instance on this system Loaded: loaded
(/usr/lib/systemd/system/elasticsearch.service; disabled; vendor
preset: enabled) Active: failed (Result: exit-code) since Sat
2015-06-06 08:33:20 EET; 1s ago
Docs: http://www.elasticsearch.org Process: 17111 ExecStart=/usr/share/elasticsearch/bin/elasticsearch
-Des.default.config=$CONF_FILE -Des.default.path.home=$ES_HOME -Des.default.path.logs=$LOG_DIR -Des.default.path.data=$DATA_DIR -Des.default.path.work=$WORK_DIR -Des.default.path.conf=$CONF_DIR (code=exited, status=3) Main PID: 17111 (code=exited, status=3)

Jun 06 08:33:20 mohammed-xubuntu elasticsearch[17111]: … 4 more
Jun 06 08:33:20 mohammed-xubuntu elasticsearch[17111]: log4j:WARN No appender…
Jun 06 08:33:20 mohammed-xubuntu elasticsearch[17111]: log4j:WARN Please init…
Jun 06 08:33:20 mohammed-xubuntu elasticsearch[17111]: log4j:WARN See http://…
Jun 06 08:33:20 mohammed-xubuntu elasticsearch[17111]: {1.5.2}: Initializatio…
Jun 06 08:33:20 mohammed-xubuntu elasticsearch[17111]: –
ElasticsearchIllegal…
Jun 06 08:33:20 mohammed-xubuntu elasticsearch[17111]: AccessDeniedException[…
Jun 06 08:33:20 mohammed-xubuntu systemd1: elasticsearch.service: main pro…D
Jun 06 08:33:20 mohammed-xubuntu systemd1: Unit elasticsearch.service ente….
Jun 06 08:33:20 mohammed-xubuntu systemd1:
elasticsearch.service failed. Hint:
Some lines were ellipsized, use -l to show in full.

It says I should pass -l option somewhere to get the full output though I don't know where exactly.