title: Filebeat fails to start when output is set to file
body: <p>I am quite new to filebeat and the ELK stack. After succesfully building a Filebeat, Elastic and Kibana stack indexing apache access logfiles, I wanted to use Filebeat to send output to a file for testing purposes. However, I keep running into an error. Filebeat starts and then immediately exits again because it is looking for elastic. </p>
  
  <p>The relevant part of the logfile is below.</p>
  
  <pre><code>2020-02-20T16:19:40.794+0100    WARN    beater/filebeat.go:152  Filebeat is unable to load the Ingest Node pipelines for the configured modules because the Elasticsearch output is not configured/enabled. If you have already loaded the Ingest Node pipelines or are using Logstash pipelines, you can ignore this warning.
  2020-02-20T16:19:40.794+0100    ERROR   instance/beat.go:916    Exiting: Index management requested but the Elasticsearch output is not configured/enabled
  </code></pre>
  
  <p>Below is the filebeat.yml that is used.</p>
  
  <pre><code>#=========================== Filebeat inputs =============================
  
  filebeat.inputs:
  - type: log
    enabled: true
    paths:
      - C:\Some\folder\*
  
  #============================= Filebeat modules ===============================
  
  filebeat.config.modules:
    path: C:\another\folder\*.yml
    reload.enabled: true
  
  #------------------------------- File output -----------------------------------
  output.file:
    enabled: true
    path: 'C:\Yet\another\folder\'
    filename: filebeat
  </code></pre>
  
  <p>I have also configured an apache.yml</p>
  
  <pre><code>- module: apache
    # Access logs
    access:
      enabled: true
  
      # Set custom paths for the log files. If left empty,
      # Filebeat will choose the paths depending on your OS.
      var.paths: ['C:\Some\Folder\2\Access*']
  
  </code></pre>
  
  <p>Filebeat keeps asking for the elastic output to be configured, but only one output can be configured at a time.
  Is there a some option I need to set?
  I am using Elastic stack 7.5</p>