The Version History page in the documentation indicates 1.4.0 was released yesterday. The documentation, itself, appears to be updated to cover the 1.4.0 release. This includes the section on installing from Helm. But, when I attempted to follow those instructions, the helm package command produces a 1.3.0 package (opendistro-es-1.3.0.tgz). And, looking at the contents of the Chart.yaml file, it also explicitly references version 1.3.0.
Is this just a case of a forgotten push or is there still development work needed (underway?) to support deploying 1.4.0 via Helm?