COD has removed the OPDB_USE_EPHEMERAL_STORAGE entitlement because it is not needed anymore. The use of COD on a cloud storage with ephemeral cache is enabled without an entitlement depending on the cluster creation parameters.
This is available starting in COD v1.37 and you do not need to upgrade to a higher version of COD to benefit from this feature.
Try the Cloudera Operational Database for free with Test Drive (no cloud account or setup is needed).