anchor.diff:  ## Elasticsearch
   
   To send logs into Elasticsearch and get a better log search experience,
  -subscribe a log filter to Cloudwatch log group.
  +subscribe a log filter to each Cloudwatch log group.
   There is a special Lambda which can do Log filtering and send logs to Elasticsearch.
   This log filter can be used to split text logs into fields:
   
  
positive.code: But it's hard to "grok" more complicated logs with such basic tool.
  It supports JSON formatted logs, so a good solution for application logs, is to configure your favorite logging framework to produce JSON logs.
  
  At this point, we can open Kibana and configure an index pattern named `cwl-*`.
  Cloudwatch log filter mimics Logstash and uses a field named `@timestamp` for timestamp.
  
negative.code: The first file allows `my-app.log` (current log file) content to appear in the Beanstalk console.
  The second file allows all (old log files) files to be archived.
  
  ## Cloudwatch Logs
  
  First of all, the log stream from Beanstalk to Cloudwatch must be enabled in Beanstalk configuration file:
  
  