Reroute Elasticsearch Unassigned Shards

reroute.sh

#!/usr/bin/sh

host=$1
port=$2

unass=`curl -s -XGET http://$host:$port/_cat/shards | grep UNASSIGN | awk '{print $1}'`

for i in $unass; do
  sors=`curl -s -XGET http://$host:$port/_cat/shards/$i | awk '{print $8}' | grep -i '\w' | sort | uniq -c | grep -i '2 ' | awk '{print $2}' | head -n 1`
  dest=`curl -s -XGET http://$host:$port/_cat/shards/$i | awk '{print $8}' | grep -i '\w' | sort | uniq -c | grep -i '1 ' | awk '{print $2}'`
  curl -XPOST http://$host:$port/_cluster/reroute -d "
  {
    \"commands\": [{
      \"move\": {
        \"index\": \"$i\",
        \"shard\": 0,
        \"from_node\": \"$sors\",
        \"to_node\": \"$dest\" }}]}"
  sleep 10
done