Limit of total fields 1000 in index... has been exceeded

## Expected Behavior

As a Graylog user I do not expect to ever hit my default limit of 1000 fields.
## Current Behavior

Installing the Illuminate content pack and nothing else generates 1047 fields and we are getting the error "Limit of total fields [1000] in index...has been exceeded"
## Possible Solution

Illuminate it appears is explicitly generating 1000+ fields. Yes we CAN modify the 1000 default field limit but ES does not recommend changing this without cause as this may cause a mappings explosion.
## Steps to Reproduce (for bugs)

1. See HS-429820990 for details.