QA: Merge query-builder-bwc to restart test (#30979)

Merges the `query-builder-bwc` qa project into the
`full-cluster-restart` qa project, saving a cluster starts on every
build and *many* cluster starts on `./gradlew bwcTests`.

Author: nik9000

qa/query-builder-bwc/src/test/java/org/elasticsearch/bwc/QueryBuilderBWCIT.java renamed to qa/full-cluster-restart/src/test/java/org/elasticsearch/upgrades/QueryBuilderBWCIT.java

@@ -17,7 +17,7 @@
  * under the License.
  */
 
-package org.elasticsearch.bwc;
+package org.elasticsearch.upgrades;
 
 import org.apache.http.util.EntityUtils;
 import org.elasticsearch.Version;
@@ -153,6 +153,21 @@ protected boolean preserveIndicesUponCompletion() {
         return true;
     }
 
+    @Override
+    protected boolean preserveSnapshotsUponCompletion() {
+        return true;
+    }
+
+    @Override
+    protected boolean preserveReposUponCompletion() {
+        return true;
+    }
+
+    @Override
+    protected boolean preserveTemplatesUponCompletion() {
+        return true;
+    }
+
     public void testQueryBuilderBWC() throws Exception {
         String index = "queries";
         if (runningAgainstOldCluster) {

qa/query-builder-bwc/build.gradle

@@ -184,6 +184,7 @@ subprojects {
       systemProperty 'tests.old_cluster_version', version.toString().minus("-SNAPSHOT")
       systemProperty 'tests.path.repo', new File(buildDir, "cluster/shared/repo")
       exclude 'org/elasticsearch/upgrades/FullClusterRestartIT.class'
+      exclude 'org/elasticsearch/upgrades/QueryBuilderBWCIT.class'
     }
 
     Task upgradedClusterTest = tasks.create(name: "${baseName}#upgradedClusterTest", type: RestIntegTestTask)
@@ -222,6 +223,7 @@ subprojects {
       systemProperty 'tests.old_cluster_version', version.toString().minus("-SNAPSHOT")
       systemProperty 'tests.path.repo', new File(buildDir, "cluster/shared/repo")
       exclude 'org/elasticsearch/upgrades/FullClusterRestartIT.class'
+      exclude 'org/elasticsearch/upgrades/QueryBuilderBWCIT.class'
     }
 
     Task versionBwcTest = tasks.create(name: "${baseName}#bwcTest") {

x-pack/qa/full-cluster-restart/build.gradle

@@ -0,0 +1,23 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+package org.elasticsearch.xpack.restart;
+
+import org.elasticsearch.common.settings.Settings;
+import org.elasticsearch.common.util.concurrent.ThreadContext;
+
+import java.nio.charset.StandardCharsets;
+import java.util.Base64;
+
+public class QueryBuilderBWCIT extends org.elasticsearch.upgrades.QueryBuilderBWCIT {
+
+    @Override
+    protected Settings restClientSettings() {
+        String token = "Basic " + Base64.getEncoder().encodeToString("test_user:x-pack-test-password".getBytes(StandardCharsets.UTF_8));
+        return Settings.builder()
+                .put(ThreadContext.PREFIX + ".Authorization", token)
+                .build();
+    }
+}