[BUG] SegmentReplicationUsingRemoteStoreIT.testDeleteOperations flaky test failure

[dreamer-89]

Coming from #8279 (comment), SegmentReplicationUsingRemoteStoreIT.testDeleteOperations is flaky.

Build with test failures: (24184,24787,24847,25220,25478)

Assertion failure

java.lang.AssertionError: Expected search hits on node: node_t3 to be at least 5 but was: 0
	at __randomizedtesting.SeedInfo.seed([9C00DEC59FC668EC:2F54B44F92E8B47A]:0)
	at org.junit.Assert.fail(Assert.java:89)
	at org.opensearch.indices.replication.SegmentReplicationBaseIT.lambda$waitForSearchableDocs$0(SegmentReplicationBaseIT.java:124)
	at org.opensearch.test.OpenSearchTestCase.assertBusy(OpenSearchTestCase.java:1086)
	at org.opensearch.indices.replication.SegmentReplicationBaseIT.waitForSearchableDocs(SegmentReplicationBaseIT.java:119)
	at org.opensearch.indices.replication.SegmentReplicationBaseIT.waitForSearchableDocs(SegmentReplicationBaseIT.java:114)
	at org.opensearch.indices.replication.SegmentReplicationBaseIT.waitForSearchableDocs(SegmentReplicationBaseIT.java:131)
	at org.opensearch.indices.replication.SegmentReplicationIT.testDeleteOperations(SegmentReplicationIT.java:651)

There are no indications of errors/exceptions in gradle check log

[gaobinlong]

org.opensearch.remotestore.SegmentReplicationUsingRemoteStoreIT.testUpdateOperations has the same problem, it's also a flaky test, see: https://build.ci.opensearch.org/job/gradle-check/27415/testReport/junit/org.opensearch.remotestore/SegmentReplicationUsingRemoteStoreIT/testUpdateOperations/