title: Logstash docker, how to stop send logs to stdout
body: <p>How to stop sending (using env variables) logs to the stdout?
  I changed log_level to WARN, and yes I don't have INFO logs anymore, but I still receiving logs like this:  </p>
  
  <pre><code>14:14:51 "namespace" =&gt; "AWS/ECS",
  14:14:51 "period" =&gt; 300,14:14:51 "ServiceName" =&gt; "archive-logstash",
  14:14:51 "@version" =&gt; "1",
  14:14:51 "ClusterName" =&gt; "archive",
  14:14:51 "minimum" =&gt; 0.4069010416666667,
  14:14:51 "average" =&gt; 44.13362219887956,
  14:14:51 "@timestamp" =&gt; 2020-03-30T14:14:42.420Z,
  14:14:51 "aws_account" =&gt; "acc",
  14:14:51 "maximum" =&gt; 71.2890625,
  14:14:51 "sample_count" =&gt; 7.0,
  14:14:51 "sum" =&gt; 308.9353553921569,
  14:14:51 "unit" =&gt; "Percent",
  14:14:51 "timestamp" =&gt; 2020-03-30T14:09:00.000Z,
  14:14:51 "end_time" =&gt; 2020-03-30T14:14:39.000Z,
  14:14:51 "metric_name" =&gt; "MemoryUtilization",
  14:14:51 "start_time" =&gt; 2020-03-30T14:09:39.000Z
  </code></pre>
  
  <p>I don't need these logs, because Logstash will be in loop, will reading from that cloudwatch group together with other logs from fargate, an send it back again to the ELK.</p>
  
  <p>Also this log format is totally unusable</p>
  
  <p>I'm running Logstash in AWS fargate</p>