title: Metricbeat creating huge number of fields
body: <p>I installed metricbeat on a unix server and it's mapping generate a massive number of fields. If there a way to disable them? I would like a default index to only create mappings for a unix "system" module mappings and windows "windows" module mappings. </p>
  
  <p>In my yml I am only showing something like this</p>
  
  <pre><code>metricbeat.modules:
  - module: system
    period: 1m
    metricsets:
      - cpu
      - load
      - memory
      #- network
      - process
      - process_summary
      #- core
      #- diskio
      #- socket
    processes: ['.*']
  
  - module: system
    period: 10m
    metricsets:
      - filesystem
      - fsstat
    processors:
    - drop_event.when.regexp:
        system.filesystem.mount_point: '^/(sys|cgroup|proc|dev|etc|host|lib)($|/)'
  
  - module: system
    period: 15m
    metricsets:
      - uptime
  </code></pre>
  
  <p>Thanks.</p>