Thank you ekost for your answer.
Unfortunately I am still a little bit confused since my usecase is a little bit different of which exposed in your link.
My usecase is not really adding an Indexer to an existing cluster, but creating a cluster by using my current standalone Indexer and by adding a new Indexer + a Master Node. So it is more a cluster creation based on an existing standalone Splunk architecture than a cluster extension.
I will be very grateful if you could clarify this particular point.
Thank you again.
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