Can the "_source" fields be dropped from events published by filebeat to ES

Elastic Stack Beats
3

Hi Badre
Thanks for your reply. Here is most of my filebeat config file.
( Feel free to suggest other improvements if you see some. I am still new to filebeat )

apiVersion: v1
kind: ConfigMap
metadata:
name: filebeat-config
namespace: default
labels:
k8s-app: xxx
app: xxx
data:

filebeat.yml: |-

processors:
- add_cloud_metadata:
- add_host_metadata:
- add_docker_metadata:
    labels.dedot: true
    annotations.dedot: true
- drop_fields:
      #fields: ["agent.ephemeral_id", "agent.hostname", "agent.id", "agent.type", "agent.version", "host.name", "ecs.version", "input.type"]
      fields:
        - "agent.ephemeral_id"
        - "agent.hostname"
        - "agent.id"
        - "agent.type"
        - "agent.version"
        - "host.name"
        - "ecs.version"
        - "input.type"
      ignore_missing: true

filebeat.autodiscover:
  providers:
    - type: docker
      # this input section is for module eg: mongo/nginx specific
      templates:
          - condition:
            contains:
              docker.container.name: echo
          config:
            - module: nginx
              enabled: true
              access:
                input:
                  type: container
                  stream: "stdout"
                  containers.ids:
                    - ${data.docker.container.id}
              error:
                input:
                  type: container
                  stream: "stdout"
                  containers.ids:
                    - ${data.docker.container.id}
        - condition:
            contains:
              docker.container.name: darwin
          config:
            - module: mongodb
              enabled: true
              log:
                input:
                  type: docker
                  containers.ids:
                    - ${data.docker.container.id}

filebeat.inputs:
 - type: log
   # this input section is for system log files
   enabled: true
   paths:
    - /var/log/*.log
    - /var/log/messages

 - type: container
   # this input section is for general application docker/containers logs
   enabled: true
   stream: all
   paths:
     - /var/lib/docker/containers/*/*.log
   include_lines: ['"pod":']

   json.keys_under_root: true
   json.ignore_decoding_error: true
   json.add_error_key: true
   json.overwrite_keys: true
   json.message_key: log

  # Avoid parsing exceptions due to name conflicts
   processors:
  - rename:
       fields:
         - from: "service"
           to: "service-name"
         - from: "error"
           to: "service-error"
         - from: "url"
           to: "service-url"
       ignore_missing: true
       fail_on_error: false