Install ElasticSearch on Debian Jessie:
Java JDK 8:
nano /etc/apt/sources.list.d/java-8-debian.list
deb http://ppa.launchpad.net/webupd8team/java/ubuntu trusty main
deb-src http://ppa.launchpad.net/webupd8team/java/ubuntu trusty main
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys EEA14886
sudo apt-get update
sudo apt-get install oracle-java8-installer
java -version
sudo apt-get install oracle-java8-set-default
ElasticSearch 5.0:
wget -qO - https://artifacts.elastic.co/GPG-KEY-elasticsearch | sudo apt-key add -
wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-5.0.1.deb
sudo dpkg -i elasticsearch-5.0.1.deb
nano /etc/elasticsearch/elasticsearch.yml
service elasticsearch start