title: What is upload_queue_size parameter in Logstash S3 output plugin?
body: <p>S3 output plugin of logstash has a config parameter called <code>upload_queue_size</code>. The documentation says: "Number of items we can keep in the local queue before uploading them". Which queue it is talking about here? and what are benefits/impacts of increasing this parameter?</p>
  
  <p>Here is the link to the docs:
  <a href="https://www.elastic.co/guide/en/logstash/current/plugins-outputs-s3.html#plugins-outputs-s3-upload_queue_size" rel="nofollow noreferrer">https://www.elastic.co/guide/en/logstash/current/plugins-outputs-s3.html#plugins-outputs-s3-upload_queue_size</a></p>