[TEST] call yaml client close method from test suite (#31591)

We added a way to close the yaml test client with #31575.
Such close method also needs to be called from the test suite though for
the additional clients to be closed.

Author: javanna

test/framework/src/main/java/org/elasticsearch/test/rest/yaml/ESClientYamlSuiteTestCase.java

@@ -31,6 +31,7 @@
 import org.elasticsearch.common.collect.Tuple;
 import org.elasticsearch.common.io.PathUtils;
 import org.elasticsearch.common.xcontent.NamedXContentRegistry;
+import org.elasticsearch.core.internal.io.IOUtils;
 import org.elasticsearch.test.rest.ESRestTestCase;
 import org.elasticsearch.test.rest.yaml.restspec.ClientYamlSuiteRestApi;
 import org.elasticsearch.test.rest.yaml.restspec.ClientYamlSuiteRestSpec;
@@ -105,6 +106,7 @@ public abstract class ESClientYamlSuiteTestCase extends ESRestTestCase {
     private static List<BlacklistedPathPatternMatcher> blacklistPathMatchers;
     private static ClientYamlTestExecutionContext restTestExecutionContext;
     private static ClientYamlTestExecutionContext adminExecutionContext;
+    private static ClientYamlTestClient clientYamlTestClient;
 
     private final ClientYamlTestCandidate testCandidate;
 
@@ -136,7 +138,7 @@ public void initAndResetContext() throws Exception {
             final Version esVersion = versionVersionTuple.v1();
             final Version masterVersion = versionVersionTuple.v2();
             logger.info("initializing client, minimum es version [{}], master version, [{}], hosts {}", esVersion, masterVersion, hosts);
-            final ClientYamlTestClient clientYamlTestClient = initClientYamlTestClient(restSpec, client(), hosts, esVersion, masterVersion);
+            clientYamlTestClient = initClientYamlTestClient(restSpec, client(), hosts, esVersion, masterVersion);
             restTestExecutionContext = new ClientYamlTestExecutionContext(clientYamlTestClient, randomizeContentType());
             adminExecutionContext = new ClientYamlTestExecutionContext(clientYamlTestClient, false);
             final String[] blacklist = resolvePathsProperty(REST_TESTS_BLACKLIST, null);
@@ -169,6 +171,18 @@ protected ClientYamlTestClient initClientYamlTestClient(
                 restClientBuilder -> configureClient(restClientBuilder, restClientSettings()));
     }
 
+    @AfterClass
+    public static void closeClient() throws IOException {
+        try {
+            IOUtils.close(clientYamlTestClient);
+        } finally {
+            blacklistPathMatchers = null;
+            restTestExecutionContext = null;
+            adminExecutionContext = null;
+            clientYamlTestClient = null;
+        }
+    }
+
     /**
      * Create parameters for this parameterized test. Uses the
      * {@link ExecutableSection#XCONTENT_REGISTRY list} of executable sections
@@ -266,13 +280,6 @@ private static void validateSpec(ClientYamlSuiteRestSpec restSpec) {
         }
     }
 
-    @AfterClass
-    public static void clearStatic() {
-        blacklistPathMatchers = null;
-        restTestExecutionContext = null;
-        adminExecutionContext = null;
-    }
-
     private static Tuple<Version, Version> readVersionsFromCatNodes(RestClient restClient) throws IOException {
         // we simply go to the _cat/nodes API and parse all versions in the cluster
         Response response = restClient.performRequest("GET", "/_cat/nodes", Collections.singletonMap("h", "version,master"));