[CI] test failure: search/190_index_prefix_search/search with uppercase regex}

[nknize]

REPRODUCE WITH: ./gradlew ':qa:mixed-cluster:v2.3.1#mixedClusterTest' --tests "org.opensearch.backwards.MixedClusterClientYamlTestSuiteIT.test {p0=search/190_index_prefix_search/search with uppercase regex}" -Dtests.seed=9CE8FA1EDFA01A69 -Dtests.security.manager=true -Dtests.jvm.argline="-XX:TieredStopAtLevel=1 -XX:ReservedCodeCacheSize=64m" -Dtests.locale=en-IE -Dtests.timezone=SystemV/YST9 -Druntime.java=17

org.opensearch.backwards.MixedClusterClientYamlTestSuiteIT > test {p0=search/190_index_prefix_search/search with uppercase regex} FAILED
    java.lang.AssertionError: Failure at [search/190_index_prefix_search:97]: hits.total didn't match expected value:
                        hits.total: expected Integer [1] but was Integer [0]
        at __randomizedtesting.SeedInfo.seed([9CE8FA1EDFA01A69:14BCC5C4715C7791]:0)
        at org.opensearch.test.rest.yaml.OpenSearchClientYamlSuiteTestCase.executeSection(OpenSearchClientYamlSuiteTestCase.java:458)
        at org.opensearch.test.rest.yaml.OpenSearchClientYamlSuiteTestCase.test(OpenSearchClientYamlSuiteTestCase.java:431)
        at jdk.internal.reflect.GeneratedMethodAccessor18.invoke(Unknown Source)
        at java.****/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.****/java.lang.reflect.Method.invoke(Method.java:568)
        at com.carrotsearch.randomizedtesting.RandomizedRunner.invoke(RandomizedRunner.java:1750)
        at com.carrotsearch.randomizedtesting.RandomizedRunner$8.evaluate(RandomizedRunner.java:938)
        at com.carrotsearch.randomizedtesting.RandomizedRunner$9.evaluate(RandomizedRunner.java:974)
        at com.carrotsearch.randomizedtesting.RandomizedRunner$10.evaluate(RandomizedRunner.java:988)
        at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
        at org.junit.rules.RunRules.evaluate(RunRules.java:20)

relates #3578

[andrross]

Fixed by #4869