Record free RAM and number of docs in an index for ElasticSearch over time

stats.sh

#!/bin/bash
########

ELASTIC_URL="<host>:9200/<index>/"
SLEEP=5

########

# AHAHHAHAHAHAHHAHAHH awwwwwful
PYTHON_CODE='
import fileinput,json

whole = ""
for line in fileinput.input():
    whole += line

j = json.loads(whole)
print j["_all"]["total"]["docs"]["count"]
'

while true; do
	cat /proc/meminfo | grep MemFree | grep -oE '[0-9]+' >> mem.txt
	curl -s "$ELASTIC_URL/_stats" | python -c "$PYTHON_CODE" >> es.txt

	echo "MEM: $(tail -n 1 mem.txt)"
	echo "DOC: $(tail -n 1 es.txt)"

	sleep $SLEEP
done