[CCR] Update README.md on how to start 2 clusters for testing (elasti…

…c#81487)

* Update Cross cluster replication README.md on how to start 2 Elasticsearch clusters for local testing.

* Update README.md for an easier CCR local testing setup

* Fix the command for a remote cluster

Co-authored-by: Kibana Machine <42973632+kibanamachine@users.noreply.github.com>

x-pack/plugins/cross_cluster_replication/README.md

@@ -4,11 +4,9 @@
 
 You can run a local cluster and simulate a remote cluster within a single Kibana directory.
 
-1. Run `yarn es snapshot --license=trial` and kill the process once the snapshot has been installed.
-2. Duplicate the ES installation by running `cp -aR .es/8.0.0 .es/8.0.0-2`.
-3. Start your "local" cluster by running `.es/8.0.0/bin/elasticsearch` and starting Kibana.
-4. Start your "remote" cluster by running `.es/8.0.0-2/bin/elasticsearch -E cluster.name=europe -E transport.port=9400`.
-5. Index a document into your remote cluster by running `curl -X PUT http://elastic:changeme@localhost:9201/my-leader-index --data '{"settings":{"number_of_shards":1,"soft_deletes.enabled":true}}' --header "Content-Type: application/json"`.
+1. Start your "local" cluster by running `yarn es snapshot --license=trial` and `yarn start` to start Kibana.
+2. Start your "remote" cluster by running `yarn es snapshot --license=trial -E cluster.name=europe -E transport.port=9400` in a separate terminal tab.
+3. Index a document into your remote cluster by running `curl -X PUT http://elastic:changeme@localhost:9201/my-leader-index --data '{"settings":{"number_of_shards":1,"soft_deletes.enabled":true}}' --header "Content-Type: application/json"`.
 Note that these settings are required for testing auto-follow pattern conflicts errors (see below).
 
 Now you can create follower indices and auto-follow patterns to replicate the `my-leader-index`