Test: do not check cluster stats in audit qa project

This commit wraps the TestCluster in one that does not check stats to prevent tripping an
assertion for the accounting breaker as the index audit trail is running in the background and
will affect the value of the breakers.

See elastic/x-pack-elasticsearch#157

Original commit: elastic/x-pack-elasticsearch@381ebbd413

qa/audit-tests/build.gradle

@@ -19,6 +19,7 @@ integTestCluster {
   distribution 'zip'
   plugin xpackProject('plugin').path
   setting 'xpack.ml.enabled', 'false'
+  setting 'xpack.monitoring.enabled', 'false'
   setting 'xpack.security.audit.enabled', 'true'
   setting 'xpack.security.audit.outputs', 'index'
   setting 'logger.level', 'DEBUG'

qa/audit-tests/src/test/java/org/elasticsearch/xpack/security/audit/IndexAuditIT.java

@@ -10,20 +10,25 @@ import org.apache.http.message.BasicHeader;
 import org.elasticsearch.action.admin.indices.template.delete.DeleteIndexTemplateResponse;
 import org.elasticsearch.action.admin.indices.template.get.GetIndexTemplatesResponse;
 import org.elasticsearch.action.search.SearchResponse;
+import org.elasticsearch.client.Client;
 import org.elasticsearch.client.Response;
 import org.elasticsearch.cluster.ClusterState;
 import org.elasticsearch.cluster.metadata.IndexTemplateMetaData;
+import org.elasticsearch.common.io.stream.NamedWriteableRegistry;
 import org.elasticsearch.common.network.NetworkModule;
 import org.elasticsearch.common.settings.SecureString;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.index.query.QueryBuilders;
 import org.elasticsearch.plugins.Plugin;
 import org.elasticsearch.test.ESIntegTestCase;
+import org.elasticsearch.test.TestCluster;
 import org.elasticsearch.xpack.core.XPackClientPlugin;
 import org.elasticsearch.xpack.core.security.SecurityField;
 import org.elasticsearch.xpack.security.audit.index.IndexAuditTrail;
 import org.elasticsearch.xpack.core.security.authc.support.UsernamePasswordToken;
 
+import java.io.IOException;
+import java.net.InetSocketAddress;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.concurrent.TimeUnit;
@@ -37,6 +42,70 @@ public class IndexAuditIT extends ESIntegTestCase {
     private static final String USER = "test_user";
     private static final String PASS = "x-pack-test-password";
 
+    @Override
+    protected TestCluster buildTestCluster(Scope scope, long seed) throws IOException {
+        TestCluster testCluster = super.buildTestCluster(scope, seed);
+        return new TestCluster(seed) {
+
+            @Override
+            public void afterTest() throws IOException {
+                testCluster.afterTest();
+            }
+
+            @Override
+            public Client client() {
+                return testCluster.client();
+            }
+
+            @Override
+            public int size() {
+                return testCluster.size();
+            }
+
+            @Override
+            public int numDataNodes() {
+                return testCluster.numDataNodes();
+            }
+
+            @Override
+            public int numDataAndMasterNodes() {
+                return testCluster.numDataAndMasterNodes();
+            }
+
+            @Override
+            public InetSocketAddress[] httpAddresses() {
+                return testCluster.httpAddresses();
+            }
+
+            @Override
+            public void close() throws IOException {
+                testCluster.close();
+            }
+
+            @Override
+            public void ensureEstimatedStats() {
+                // stats are not going to be accurate for these tests since the index audit trail
+                // is running and changing the values so we wrap the test cluster to skip these
+                // checks
+            }
+
+            @Override
+            public String getClusterName() {
+                return testCluster.getClusterName();
+            }
+
+            @Override
+            public Iterable<Client> getClients() {
+                return testCluster.getClients();
+            }
+
+            @Override
+            public NamedWriteableRegistry getNamedWriteableRegistry() {
+                return testCluster.getNamedWriteableRegistry();
+            }
+        };
+    }
+
     public void testIndexAuditTrailWorking() throws Exception {
         Response response = getRestClient().performRequest("GET", "/",
                 new BasicHeader(UsernamePasswordToken.BASIC_AUTH_HEADER,