Rolling upgrade for Elasticsearch and Kibana

upgrade_es_kib.sh

esversion="5.5.2"
kibversion="5.5.2"
username=<specify>
password=<specify>
nodecount=4 #change


oldesv=$(dpkg -s elasticsearch 2>/dev/null | grep Version | cut -f2 -d' ')
oldkibv=$(dpkg -s kibana 2>/dev/null | grep Version | cut -f2 -d' ')

if [[ -z $(apt-key list | grep "Elasticsearch Signing Key") ]]; then
  wget -qO - https://packages.elastic.co/GPG-KEY-elasticsearch | apt-key add -
fi

if [[ -z $(sudo apt list 2>/dev/null | grep apt-transport-https) ]]; then
  sudo apt-get update && sudo apt-get install apt-transport-https  
fi

if [[ ! -f /etc/apt/sources.list.d/elastic-5.x.list ]]; then
  echo "deb https://artifacts.elastic.co/packages/5.x/apt stable main" | sudo tee -a /etc/apt/sources.list.d/elastic-5.x.list
fi

upgrade_elastic(){

  if [ $esversion != $oldesv ]; then
    
    #disable allocation
    curl -d '{"transient": {"cluster.routing.allocation.enable": "none"}}' \
       -u $username:$password -k -X PUT https://localhost:9200/_cluster/settings
    
    sudo apt-get update
    sudo service elasticsearch stop
    sudo apt-get -y install elasticsearch=$esversion
    sudo /usr/share/elasticsearch/bin/elasticsearch-plugin remove x-pack
    sudo /usr/share/elasticsearch/bin/elasticsearch-plugin remove repository-azure
    sudo /usr/share/elasticsearch/bin/elasticsearch-plugin install x-pack
    sudo /usr/share/elasticsearch/bin/elasticsearch-plugin install repository-azure
    sudo service elasticsearch start

    while [[ $(curl -u $username:$password -k -s https://localhost:9200/_cat/nodes | wc -l) != $nodecount ]]; do
    	sleep 2
    	echo "Waiting for the sun..."
    done

    # flush 
    curl -u $username:$password -k -X POST -d '' https://localhost:9200/_flush/synced

    # enable allocation
    curl -d '{"transient": {"cluster.routing.allocation.enable": "all"}}' \
       -u $username:$password -k -X PUT https://localhost:9200/_cluster/settings

  fi

}

upgrade_kibana(){

  if [ $kibversion != $oldkibv ]; then
        
    sudo apt-get update
    sudo service kibana stop
    sudo apt-get -y install kibana=$kibversion
    sudo /usr/share/kibana/bin/kibana-plugin remove x-pack
    sudo /usr/share/kibana/bin/kibana-plugin install x-pack
    sudo service kibana start

  fi

}

upgrade_elastic

if [ ! -z $oldkibv ]; then
  upgrade_kibana
fi