Fix flaky tests in SplitIndexIT#20265

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liuguoqingfz wants to merge 1 commit intoopensearch-project:mainfrom

liuguoqingfz:flakytest-19341

Commits on Dec 16, 2025

Force long intervals for retention-lease sync + global-checkpoint sync on both source and target.After restoring rebalancing in finally, wait for the cluster to settle and for those tasks to drain …
liuguoqingfz
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