Old elastic search documentation 3.4.x should be removed/updated.

[ianwallen]

Describe the bug
The following seems to document old elastic search setup steps.

core-geonetwork/docs/manual/docs/maintainer-guide/statistics/setup-elasticsearch.md

Lines 29 to 39 in 39550ef

	## Load indexes
	``` shell
	$ cd /tmp
	$ curl -O https://github.com/geonetwork/core-geonetwork/3.4.x/es/config/features.json
	$ curl -X PUT http://localhost:9200/gn-features -d @features.json
	$ curl -O https://github.com/geonetwork/core-geonetwork/3.4.x/es/config/records.json
	$ curl -X PUT http://localhost:9200/gn-records -d @records.json
	$ curl -O https://github.com/geonetwork/core-geonetwork/3.4.x/es/config/searchlogs.json
	$ curl -X PUT http://localhost:9200/gn-searchlogs -d @searchlogs.json
	```

Looks like the more recent documentation is here.
https://github.com/geonetwork/core-geonetwork/blob/main/es/README.md#configuration

Can we remove the old documentation?