assigned all the unassigned shards quickly.

gistfile1.sh

#!/bin/bash -e

for index in $(curl -sXGET http://localhost:9200/_cat/shards | grep UNASSIGNED | awk '{print $1}' | uniq); do
  i=1
  for shard in $(curl -XGET http://localhost:9200/_cat/shards?index=$index | grep UNASSIGNED | awk '{print $2}'); do
    echo "$shard on $index going on datanode$i"  
      curl -sXPOST 'localhost:9200/_cluster/reroute' -d '{
          "commands" : [ {
                "allocate" : {
                    "index" : "'$index'", 
                    "shard" : '$shard', 
                    "node" : "datanode'$i'", 
                    "allow_primary" : true
                }
              }
          ]
      }' &> /dev/null
      sleep 5
      i=$((i + 1)) 
  done
done