Thank you, David, for your prompt response!
Therefore, as es_b, es_c, es_d, es_e are agnostic of who is accessing them, there will be no flapping signal. e.g. es_a or es_a1 to lose es_b or es_c, etc. periodically
I also assume that any elasticsearch version (we use v6+) supporting cross-cluster search is working fine too!
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