Still need to find out what this means, I'd like to keep things "default" apart from the replica number
curl -XPUT -k -u elastic:$pass https://localhost:9200/_index_template/replicas -d '{"index_patterns": ["*"], "template": {"settings": {"number_of_replicas": "0"}},"priority": 7}' -H 'Content-Type: application/json'
{"error":{"root_cause":[{"type":"illegal_argument_exception","reason":"composable template [replicas] with index patterns [], priority [7] and no data stream configuration would cause data streams [.monitoring-es-8-mb] to no longer match a data stream template"}],"type":"illegal_argument_exception","reason":"composable template [replicas] with index patterns [], priority [7] and no data stream configuration would cause data streams [.monitoring-es-8-mb] to no longer match a data stream template"},"status":400}