Cannot append_fields on custom template

Elastic Stack Beats
1

Hello!

I am using filebeat 7.17.6 and I am using the nginx module.

I have altered the access log pipeline to include additional fields.
Everything is grokked fine.

My issue is that when i define the additional fields they are added to the filebeat-* template and not to my custom nginx-logs* template.

my config :

name: ${BEAT_NAME:default}
filebeat.modules:
  #--------------------------------- Nginx Module ---------------------------------
  - module: nginx
    # Access logs
    access:
      enabled: true
      var.paths: ["/nginx/*access.log"]
    error:
      enabled: true
      var.paths: ["/nginx/error.log"]


setup.template.settings:
  index.number_of_shards: 1


output.elasticsearch:
  # Array of hosts to connect to.
  hosts: ["172.17.0.1:9243"]
  index: "nginx-logs-%{+yyyy.MM.dd}"
  username: "beat_user"
  password: "beat_pass"
  protocol: https
  ssl.verification_mode: none
  headers:
    X-Found-Cluster: ${FILEBEAT_OUTPUT_ES_CLUSTER_ID}

setup:
  ilm:
    enabled: true
    overwrite: true
    rollover_alias: "nginx-logs"
    pattern: "{now/d}-000001"
    policy_file: /usr/share/filebeat/ilm.policy.nginx.json
  template:
    name: "nginx-logs"
    overwrite: true
    pattern: "nginx-logs*"
    append_fields:
        - name: nginx.access.request_time
          type: float
        - name: nginx.access.upstream_header_time
          type: float
        - name: nginx.access.upstream_connect_time
          type: float
        - name: nginx.access.upstream_response_time
          type: float

xpack.monitoring.enabled: true
2

I had another filebeat instance running which created the indices anew after deleting them.
The above solution works.

Closing.