Elasticsearch/Filebeat _meta/fields.yml not loading into kibana

I'm assigned to a filebeat plugin of our product. I wrote a IngestPipeline and de default mapping is in various ways unfortunately so i wanted to change this with the _meta/fields.yml.
I configured the yml file accordingly to:
https://www.elastic.co/guide/en/beats/devguide/7.8/filebeat-modules-devguide.html#_metafields_yml_2
https://www.elastic.co/guide/en/beats/devguide/current/event-fields-yml.html
https://github.com/elastic/kibana/issues/82273

My yml file looks like this:

- key: pac
  title: "pac"
  description: Description missing
    pac Module
  fields:
    - name: pac.log
      type: group
      description: Description missing
      fields:
        - name: deo
          type: group
          description: Description missing
          fields:
            - name: duration
              type: long
              description: Duration of the deo
            - name: category
              type: keyword
              description: Category of the deo
            - name: owner
              type: keyword
              description: User of the deo
            - name: version
              type: float
              description: Version of the deo
            - name: name
              type: keyword
              description: Name of the deo
            - name: reference
              type: double
              description: Referencenumber of the deo
            - name: state
              type: keyword
              description: State of the deo
            - name: status
              type: keyword
              description: Status of the deo
            - name: trigger
              type: group
              description: Description missing
              fields:
                - name: category
                  type: keyword
                  description: Category of the deo-trigger
                - name: name
                  type: text
                  description: Name of the deo-trigger
                - name: path
                  type: text
                  description: Full-Text of the trigger properties
                - name: provider
                  type: keyword
                  description: Supplier of the deo-trigger
            - name: wiring
              type: group
              description: Description missing
              fields:
                - name: async
                  type: boolean
                  description: If deos wired asynchronously
                - name: deoId
                  type: keyword
                  description: Identification number of the deo
                - name: execute
                  type: boolean
                  description: If deo is executed or not
                - name: owner
                  type: keyword
                  description: User of the deo
                - name: shared
                  type: boolean
                  description: Deo was shared
                - name: stopOnError
                  type: boolean
                  description: If deo stopped on Error
        - name: do
          type: group
          description: Description missing
          fields:
            - name: name
              type: keyword
              description: Name of the do task
            - name: state
              type: group
              description: Description missing
              fields:
                - name: from
                  type: keyword
                  description: State from which the do task was used
                - name: to
                  type: keyword
                  description: State to which the do task was switched
        - name: esa
          type: group
          description: Description missing
          fields:
            - name: connection
              type: keyword
              description: Connection status of the ESA
            - name: name
              type: keyword
              description: Name of the ESA
            - name: state
              type: group
              description: Description missing
              fields:
                - name: from
                  type: keyword
                  description: State from which the ESA Connection was established
                - name: to
                  type: keyword
                  description: State to which the ESA Connection was established
        - name: monitor
          type: group
          description: Description missing
          fields:
            - name: heap
              type: group
              description: Description missing
              fields:
                - name: bytes
                  type: long
                  description: Used bytes of the heap
                - name: pct
                  type: float
                  description: Percentage of the maximum available bytes
            - name: heapgc
              type: group
              description: Description missing
              fields:
                - name: bytes
                  type: long
                  description: Used bytes of the heapgc
                - name: pct
                  type: float
                  description: Percentage of the maximum available bytes
        - name: service
          type: group
          description: Description missing
          fields:
            - name: class
              type: keyword
              description: Class of the service
            - name: duration
              type: long
              description: How long the service call took
            - name: name
              type: keyword
              description: Name of the service call
            - name: operation
              type: keyword
              description: Operation type of the service call
            - name: success
              type: boolean
              description: Was the service call successfull or not
        - name: system
          type: group
          description: Description missing
          fields:
            - name: category
              type: keyword
              description: Category of the System
            - name: priority
              type: keyword
              description: Priority of the System
            - name: monitor
              type: group
              description: Description missing
              fields:
                - name: cpu
                  type: group
                  description: Description missing
                  fields:
                    - name: pct
                      type: float
                      description: Percentage of the cpu usage
        - name: wiring
          type: text
          description: Description missing
        - name: meta
          type: text
          description: Description missing
        - name: tags
          type: keyword
          description: Description missing
        - name: timestamp
          type: date
          description: Description missing
        - name: level
          type: keyword
          description: Description missing
        - name: logger
          type: keyword
          description:  Description missing

I would like to have the field types as configured in the fields.yml file. But at first no mapping is available and if i start to send logs the mapping for my fields is created automatically with unfortunate types.

The yaml file works as it is in the description above. My Problem was that my collegue from whom i inherited the project didn't use the filebeat build script. So the uploaded fields.yml file wasn't extended by my fields. I reconfigured the fields.yaml path inside the filebeat.yml configuration file and now it works.