Elasticsearch is not running after update to 2.3.3

Elastic Stack Elasticsearch
1

I have ubuntu server in Oracle Virtualbox.
this morning I upgraded the elastic from version 2.2.1 to 2.3.3 and I can not turn on the service of elasticsearch.

after i make 'sudo service elasticsearch restart' the status is 'elasticsearch is not running
'
do you have any idea?

2

Check elastic log at /var/log/elasticsearch/.log - see if it throws any errors

3

I checked and no new log file today.