I've been attempting to do some cursory research on how best to create
clients for an Elasticsearch cluster on EC2. In reading through
it would appear that having a Node client on our ES client applications
that is cluster aware would be ideal since it would (hypothetically) avoid
two hop requests. Is that a correct assumption? If one always has the
option, is there ever a situation where it is more desirable to use the
Transport client over the Node client?
Now, if we also assume that EC2 is the target deployment environment, where
being a part of an ES cluster involves discovery using the AWS API instead
of multi/unicast, is using a Node client problematic in this scenario?
Additionally for EC2, are there any other topologies one can consider for a
single cluster other than just having a homogenous set of instances that
are data nodes and then client applications with Node clients? For
instance, would there be any advantage to having a dedicated number of
instances that are data=false Nodes that use an EC2 instance type that
support high network performance (with enhanced networking, see
https://aws.amazon.com/ec2/instance-types/) that join the cluster of a
large number of less powerful instances that are data nodes and then have
ElasticSearch client applications just round-robin with transport clients
to those data=false Nodes?
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