[BUG] Test org.opensearch.indices.IndicesRequestCacheIT.testInvalidStalenessThresholdUpdateThrowsException {p0={"opensearch.experimental.feature.pluggable.caching.enabled":"true"}} is flaky

[BUG] Test org.opensearch.indices.IndicesRequestCacheIT.testInvalidStalenessThresholdUpdateThrowsException {p0={"opensearch.experimental.feature.pluggable.caching.enabled":"true"}} is flaky #6277