avoiding container extension

[l-trotta]

We merged #3107 which adds a class extending a container, which java doesn't support. I could add an exception in the generator, but since it's only two fields I'd prefer writing the extended class definition.

[github-actions]

Following you can find the validation results for the APIs you have changed.

API	Status	Request	Response
ingest.delete_geoip_database	🟢	1/1	1/1
ingest.delete_ip_location_database	🟢	1/1	1/1
ingest.delete_pipeline	🟢	15/15	15/15
ingest.geo_ip_stats	🟢	1/1	1/1
ingest.get_geoip_database	🟢	6/6	6/6
ingest.get_ip_location_database	🟢	7/7	7/7
ingest.get_pipeline	🟢	22/22	22/22
ingest.processor_grok	🟢	1/1	1/1
ingest.put_geoip_database	🟢	3/3	3/3
ingest.put_ip_location_database	🟢	4/4	4/4
ingest.put_pipeline	🟢	60/60	60/60
ingest.simulate	🟢	10/10	10/10

You can validate these APIs yourself by using the make validate target.