Two problems:

• Help for opennms:send-events-to-elasticsearch karaf command has description for username and password reversed.

• features/opennms-es-rest/src/main/java/org/opennms/plugins/elasticsearch/rest/archive/OnmsHistoricEventsToEs.java calls OnmsRestEventsClient(onmsUrl, onmsPassWord, onmsUserName) where that method is expecting username/password in the opposite order.

Tests use admin/admin, so they missed this for use cases where the username and password are different.