demo of https://github.com/elasticsearch/elasticsearch/issues/8823

8823-demo.sh

#!/bin/bash

pkill -f 'elasticsearch.*cluster.name=8823'

rm -rf data/8823

bin/elasticsearch -Des.node.master=true -Des.cluster.name=8823 -Des.node.name=master 2>&1 >/dev/null &
sleep 1
bin/elasticsearch -Des.node.master=false -Des.cluster.name=8823 -Des.node.name=data1 2>&1 >/dev/null &
sleep 1
bin/elasticsearch -Des.node.master=false -Des.cluster.name=8823 -Des.node.name=data2 2>&1 >/dev/null &
until curl -s localhost:9200/; do echo "--- waiting for master node start..."; sleep 1; done
until curl -s localhost:9201/; do echo "--- waiting for data1 node start..."; sleep 1; done
until curl -s localhost:9202/; do echo "--- waiting for data2 node start..."; sleep 1; done

curl localhost:9200/_cluster/health\?wait_for_status=green
echo; echo; echo " --- healthy cluster, no indices ---"
sleep 5

curl -XPUT localhost:9200/test/test/1 -d '{"foo":"bar"}'

curl localhost:9200/_cluster/health\?wait_for_status=green

echo; echo; echo " --- healthy cluster, one index ---"

find data/8823 -name _state

echo; echo; echo " --- index state directories ---"

sleep 5

echo "--- killing master..."
pkill -f 'elasticsearch.*master=true.*cluster.name=8823'

while pgrep -fq 'elasticsearch.*master=true.*cluster.name=8823'; do echo "waiting for node stop..."; sleep 1; done

rm -rvf data/8823/nodes/0
echo; echo "--- deleted master data directory"

find data/8823 -name _state

echo "--- data1 and data2 index state remains"

echo "--- waiting for master node start..."

bin/elasticsearch -Des.node.master=true -Des.cluster.name=8823 -Des.node.name=master 2>&1 >/dev/null &

curl localhost:9201/_cluster/health\?wait_for_status=green

echo; echo; echo "--- healthy cluster, no indices ---"

sleep 3

find data/8823 -name _state

echo "--- data1 and data2 index state deleted ---"
pkill -f 'elasticsearch.*cluster.name=8823'