Does it mean that you modified manually the logs you pasted initially and that I should have read 9200 instead of 9300? As I don't have a clear view on what you are exactly doing it's hard to answer.
But one comment though: You have 3252 shards on 6 data nodes. Which means 542 shards per node. So I assume that your nodes have more than 28 gb of HEAP size. Is that true?
What are the elasticsearch logs please?
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