Overview

On a 7.10 I/O optimized deployment on Cloud, the user has the option of selecting node roles or custom node attributes for controlling data allocation in ILM.

Node roles

When the user selects node roles, the UI indicates that warm nodes have been configured for the warm data tier, and that cold nodes have been configured for the cold data tier.

Custom node attributes

When the user selects custom node attributes, they're prompted to add some to elasticsearch.yml.

Node configuration

Some nodes in the cluster have been configured with a combination of "roles": ["data"] and "data": true.

Questions

1. [ILM] Cloud-specific changes for 7.10 #79650 changes the cold phase prompt for the node role option to prompt the user to add a cold tier in Cloud if no node has been tagged with the data_cold node role. Shouldn't we update the warm phase with a similar prompt?

2. Cloud users can't add custom node attributes to their elasticsearch.yml. What would be the appropriate guidance for a Cloud user?

CC @bleskes @jloleysens @jethr0null