Elasticsearch version migration

1. Prepare files and packages and plugins
2. Extract elasticsearch and install plugin 
    sudo bin/elasticsearch-plugin install file:///path/to/plugin.zip

3. Compress the elasticsearch after installing plugins
4. Move the compressed elasticsearch to the remote servers

5. Extract the compressed elasticsearch on the remote servers
6. Update concurrent recovery for the current cluster


7. Disable shard allocation




8. Node flush
curl -X POST "localhost:9200/_flush/synced?pretty"
GET /_cluster/health?pretty

9. Shutdown
10. Startup and tail logs


11. health_check node
GET /_cluster/health?pretty


12. enable shard allocation
host=$1
port=$2
curl -XPUT "http://YY.XX.ZZZ.YXZ:9200/_cluster/settings" -H 'Content-Type: application/json' -d '{
"transient" : { "cluster.routing.allocation.enable" : null } }'

curl -XPUT "http://YY.XX.ZZZ.YXZ:9200/_cluster/settings" -H 'Content-Type: application/json' -d '{
"persistent" : { "cluster.routing.allocation.enable" : null } }'

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