Is there a way to run Elastic cloud on Kubernetes (ECK) with helm3?
As much as i know, there is no helm chart for ECK operator however for the Elasticsearch stack there is a helm chart available.
Elastic stack helm chart : https://github.com/elastic/helm-charts/tree/master/elasticsearch
ECK is operate you can extend Kubernetes orchestration by YAML files or else you can create own helm chart as per need if required.
ECK quick deploy : https://www.elastic.co/guide/en/cloud-on-k8s/current/k8s-quickstart.html
ECK is providing official support in GKE however i think you have idea about the advantages & disadvantages of using ECK.