Security on Elastic Search Service

I deployed an elastic search service cluster on the cloud, and we are looking forward to set this up on production.
are there any security aspects we should take care of?
I have no control over the deployment (just add more nodes, memory, type of cluster, etc) and i belive all the nodes are secure within the cluster, but i need to understand:

  1. Do we need to add certificates for beats?. Traffic is https to * sites.
  2. What about clients using kibana, or SAML authentication?

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