fix(metricbeat): limit of total fields exceeded

The current configuration requires a number of fields which exceeds the
default limit of 10000 fields.

Ref. #1020

extensions/metricbeat/config/metricbeat.yml

@@ -15,6 +15,9 @@ 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 ]