fix(metricbeat): limit of total fields exceeded

The current configuration requires a number of fields which exceeds the
current limit. From the Metricbeat event logs:

  Limit of total fields [10200] has been exceeded while adding new
  fields [7]

We raised this limit from its default of 10000 to 10200 in the commit
035a0e7, but it was since raised to
1250 upstream in v8.16.2 (elastic/beats#41640), making that
configuration unnecessary.

Ref. #1059

Author: antoineco

extensions/metricbeat/config/metricbeat.yml

@@ -15,9 +15,6 @@ metricbeat.autodiscover:
     - type: docker
       hints.enabled: true
 
-# With all the modules below enabled, we exceed the default limit of 10000 fields.
-setup.template.settings.index.mapping.total_fields.limit: 10200
-
 metricbeat.modules:
 - module: elasticsearch
   hosts: [ http://elasticsearch:9200 ]