Install & Setup ElasticSearch 
Author: Josef Jezek
Check Download page for latest version of ElasticSearch and update VERSION
sudo apt-get update
sudo apt-get install openjdk-7-jre-headless wget curl -y
VERSION=0.20.6
wget https://download.elasticsearch.org/elasticsearch/elasticsearch/elasticsearch-$VERSION.deb
sudo dpkg -i elasticsearch-$VERSION.deb
sudo service elasticsearch start
yum install java-1.7.0-openjdk wget curl -y
wget --no-cookies --no-check-certificate \
--header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com" \
"http://download.oracle.com/otn-pub/java/jdk/7u51-b13/jdk-7u51-linux-x64.rpm"
vi + /etc/profile
Add the follwing to the end:
JAVA_HOME=/usr/java/jdk1.7.0_51
JRE_HOME=/usr/java/jdk1.7.0_51/jre
PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib
export JAVA_HOME JRE_HOME PATH CLASSPATH
VERSION=0.90.0.RC2
wget https://download.elasticsearch.org/elasticsearch/elasticsearch/elasticsearch-$VERSION.noarch.rpm
sudo rpm -i elasticsearch-$VERSION.noarch.rpm
sudo service elasticsearch start
curl http://localhost:9200
curl -XGET 'http://localhost:9200/_cluster/health?pretty=true'
curl -XGET 'http://localhost:9200/_cluster/state'