logstash - free command

logstash-free.conf

input {
	exec {
		command => "free -b"
		interval => 10
	}
}
filter {
	grok {
		match => {
			"message" => ".*?Mem:\s*?%{NUMBER:total}\s*?%{NUMBER:used}\s*?%{NUMBER:free}\s*?%{NUMBER:shared}\s*?%{NUMBER:buffers}\s*?%{NUMBER:cached}\s*?\-/\+ buffers/cache:\s*?%{NUMBER:actual.used}\s*?%{NUMBER:actual.free}\s*?Swap:\s*?%{NUMBER:swap.total}\s*?%{NUMBER:swap.used}\s*?%{NUMBER:swap.free}.*"
		}
		remove_field => [ "message", "command" ]
	}
	mutate {
    	convert => {
			"total" => "integer"
			"used" => "integer"
			"free" => "integer"
			"shared" => "integer"
			"buffers" => "integer"
			"cached" => "integer"
			"actual.used" => "integer"
			"actual.free" => "integer"
			"swap.total" => "integer"
			"swap.used" => "integer"
			"swap.free" => "integer"
		}
	}
}
output {
	elasticsearch {
		hosts => "elasticsearch:9200"
		index => "free-%{+YYYY.MM.dd}"
	}
}