Bash script old elasticsearch indices cleanup when not enough space (>90%) when watermark

Delete elk old indices when not enough space

#!/bin/bash

CAPACITY=`df | grep '/dev/disk1' | awk '{print $5}' | tr -d '%'`

while [  $CAPACITY -gt 90 ]; do

  INDEXNAME=`curl -s localhost:9200/_cat/indices/cloudwatch* | sort -n | head -1 | awk '{print $3}'`

  curl -XDELETE localhost:9200/$INDEXNAME

  echo "Deleted $INDEXNAME"

  CAPACITY=`df | grep '<change this to disk>' | awk '{print $5}' | tr -d '%'`

  sleep 60

done