MSI - Configure ML node role

[pheyos]

During the installation process it is currently possible to define a single node role or a set of node roles (master, data, ingest and implicitly coordinating only by deselecting all others).

There is another node role which is currently not covered by this configuration: ML. By default all nodes are ML nodes (with non-basic X-Pack license), so this doesn't block ML usage, but this means the coordinating only setup is actually coordinating + ML.

It would be good to have the option of defining a Machine Learning only node and a real coordinating only node.

This might be tricky, because it has interdependencies with the X-Pack license configuration.

[russcam]

This might be tricky, because it has interdependencies with the X-Pack license configuration.

We discussed previously about including the ML node role and this was one of the reasons that we decided not to expose it in the UI at the time.

[codebrain]

Perhaps something to revisit now 6.3.0 is out.

[ghost]

I noted this to be looked at.