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When using a Tribe Nodes you need to take extra steps to secure its communication with the connected clusters
You will need to update the configuration for several clients to work with a secured cluster:
X-Pack security enables you to secure you Elasticsearch cluster. But Elasticsearch itself is only one product within the Elastic Stack. It is often the case that other products in the stack are connected to the cluster and therefore need to be secured as well, or at least communicate with the cluster in a secured way: