[8.0] Batch rollover cluster state updates. (#79945) #80392
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In cases where many indices are managed by ILM, it is likely that rollovers for different indices or data streams happen concurrently. This change allows the cluster state updates that these rollovers generate to be batch. This change also changes the rollover service to not do a reroute and instead perform a single reroute for multiple batched rollovers. Relates to elastic#77466 Closes to elastic#79782
martijnvg
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Backports the following commits to 8.0: