Logstash log_format for Nginx

gistfile1.txt

    log_format logstash_json '{ "@timestamp": "$time_iso8601", '
                         '"@version": "1", '
                         '"remote_addr": "$remote_addr", '
                         '"body_bytes_sent": "$body_bytes_sent", '
                         '"request_time": "$request_time", '
                         '"upstream_addr": "$upstream_addr", '
                         '"upstream_status": "$upstream_status", '
                         '"upstream_response_time": "$upstream_response_time", '
                         '"status": "$status", '
                         '"uri": "$uri", '
                         '"query_strings": "$query_string", '
                         '"request_method": "$request_method", '
                         '"http_referrer": "$http_referer", '
                         '"http_host": "$http_host", '
                         '"scheme": "$scheme", '
                         '"http_user_agent": "$http_user_agent" }';