elasticsearch check (latest entry)

#!/bin/bash
# config

es_server="localhost"
es_port=9200
es_type=auctions
critmaxseconds=7200
warnmaxseconds=4500

latestentry=`curl -s -X POST "http://$es_server:$es_port/$es_type/_search?fields=_timestamp&pretty" -d '
{
 "sort":{"_timestamp": "desc"},
 "size": 1
}' | grep _timestamp |sed "s/.*: //" | sed "s/,//" `

let latestentrysec=$latestentry/1000

currentsec=`date +"%s"`
let difference=$currentsec-$latestentrysec

if [ $critmaxseconds -lt $difference ] ; then
  echo "CRITICAL: Latest Entry Age = $difference"
  exit 2
fi

if [ $warnmaxseconds -lt $difference ] ; then
  echo "WARNING: Latest Entry Age = $difference"
  exit 1
fi

echo "OK: Latest Entry Age = $difference"
exit 0