Adding a test feature flag for random sampling (#136225)

This change makes sure that the random sampling feature flag is enabled
for various yaml rest test runners even when running in non-snapshot
mode. Closes #135975 Closes #135989 Closes #135993 Closes #136190

Author: masseyke

muted-tests.yml

@@ -603,24 +603,15 @@ tests:
 - class: org.elasticsearch.xpack.esql.action.EsqlActionBreakerIT
   method: testTopNPushedToLuceneOnSortedIndex
   issue: https://github.com/elastic/elasticsearch/issues/135939
-- class: org.elasticsearch.test.rest.ClientYamlTestSuiteIT
-  method: test {yaml=indices.get_sample/10_basic/Test get sample for index with no sample config}
-  issue: https://github.com/elastic/elasticsearch/issues/135975
 - class: org.elasticsearch.xpack.esql.action.CrossClusterAsyncQueryStopIT
   method: testStopQueryInlineStats
   issue: https://github.com/elastic/elasticsearch/issues/135032
 - class: org.elasticsearch.xpack.esql.plan.logical.local.ImmediateLocalSupplierTests
   method: testEqualsAndHashcode
   issue: https://github.com/elastic/elasticsearch/issues/135977
-- class: org.elasticsearch.smoketest.SmokeTestMultiNodeClientYamlTestSuiteIT
-  method: test {yaml=indices.get_sample/10_basic/Test get sample for index with no sample config}
-  issue: https://github.com/elastic/elasticsearch/issues/135989
 - class: org.elasticsearch.compute.data.BasicPageTests
   method: testEqualityAndHashCode
   issue: https://github.com/elastic/elasticsearch/issues/135990
-- class: org.elasticsearch.xpack.security.CoreWithSecurityClientYamlTestSuiteIT
-  method: test {yaml=indices.get_sample/10_basic/Test get sample for index with no sample config}
-  issue: https://github.com/elastic/elasticsearch/issues/135993
 - class: org.elasticsearch.xpack.ml.integration.RegressionIT
   method: testAliasFields
   issue: https://github.com/elastic/elasticsearch/issues/135996

qa/smoke-test-multinode/src/yamlRestTest/java/org/elasticsearch/smoketest/SmokeTestMultiNodeClientYamlTestSuiteIT.java

@@ -38,6 +38,7 @@ public class SmokeTestMultiNodeClientYamlTestSuiteIT extends ESClientYamlSuiteTe
         .feature(FeatureFlag.SUB_OBJECTS_AUTO_ENABLED)
         .feature(FeatureFlag.DOC_VALUES_SKIPPER)
         .feature(FeatureFlag.SYNTHETIC_VECTORS)
+        .feature(FeatureFlag.RANDOM_SAMPLING)
         .build();
 
     public SmokeTestMultiNodeClientYamlTestSuiteIT(@Name("yaml") ClientYamlTestCandidate testCandidate) {

rest-api-spec/src/yamlRestTest/java/org/elasticsearch/test/rest/ClientYamlTestSuiteIT.java

@@ -38,6 +38,7 @@ public class ClientYamlTestSuiteIT extends ESClientYamlSuiteTestCase {
         .feature(FeatureFlag.SUB_OBJECTS_AUTO_ENABLED)
         .feature(FeatureFlag.DOC_VALUES_SKIPPER)
         .feature(FeatureFlag.SYNTHETIC_VECTORS)
+        .feature(FeatureFlag.RANDOM_SAMPLING)
         .build();
 
     public ClientYamlTestSuiteIT(@Name("yaml") ClientYamlTestCandidate testCandidate) {

test/test-clusters/src/main/java/org/elasticsearch/test/cluster/FeatureFlag.java

@@ -25,7 +25,8 @@ public enum FeatureFlag {
         "es.index_dimensions_tsid_optimization_feature_flag_enabled=true",
         Version.fromString("9.2.0"),
         null
-    );
+    ),
+    RANDOM_SAMPLING("es.random_sampling_feature_flag_enabled=true", Version.fromString("9.2.0"), null);
 
     public final String systemProperty;
     public final Version from;

x-pack/qa/core-rest-tests-with-security/src/yamlRestTest/java/org/elasticsearch/xpack/security/CoreWithSecurityClientYamlTestSuiteIT.java

@@ -52,6 +52,7 @@ public class CoreWithSecurityClientYamlTestSuiteIT extends ESClientYamlSuiteTest
         .feature(FeatureFlag.SUB_OBJECTS_AUTO_ENABLED)
         .feature(FeatureFlag.DOC_VALUES_SKIPPER)
         .feature(FeatureFlag.SYNTHETIC_VECTORS)
+        .feature(FeatureFlag.RANDOM_SAMPLING)
         .build();
 
     public CoreWithSecurityClientYamlTestSuiteIT(@Name("yaml") ClientYamlTestCandidate testCandidate) {