Rather than installing a dedicated Elastic Cluster for my DataMiner System, can I point it to an existing Elastic Cluster that I have?
As Gelber mentioned, the version should match 6.x.x (preferably 6.8.x, so DataMiner can leverage the free security features).
On top of that, it must be made sure that if the customer uses this Elastic cluster for other purposes, they don't start their indices with "dms-", this might give some conflicts.
It's indeed possible, provided that the external Elastic cluster has the correct version to work with DataMiner. The configuration is done via the DB.xml file, as per the Help section here.
By using an external cluster, it's important to be sure it won't contain any other index that might conflict (i.e., The Elastic cluster is in use by another DataMiner agent not in a DMS).
Thanks Thomas!