Restore rolling upgrade test for the _all field

This commit adapts the rolling upgrade test introduced in elastic#37808
to ignore runs that upgrade from a version on or after 7.0.

Closes elastic#41453

qa/rolling-upgrade/build.gradle

@@ -70,6 +70,7 @@ for (Version version : bwcVersions.wireCompatible) {
   Task oldClusterTestRunner = tasks.getByName("${baseName}#oldClusterTestRunner")
   oldClusterTestRunner.configure {
     systemProperty 'tests.rest.suite', 'old_cluster'
+    systemProperty 'tests.upgrade_from_version', version.toString().replace('-SNAPSHOT', '')
   }
 
   Closure configureUpgradeCluster = {String name, Task lastRunner, int stopNode, Closure getOtherUnicastHostAddresses ->
@@ -95,6 +96,7 @@ for (Version version : bwcVersions.wireCompatible) {
   Task oneThirdUpgradedTestRunner = tasks.getByName("${baseName}#oneThirdUpgradedTestRunner")
   oneThirdUpgradedTestRunner.configure {
     systemProperty 'tests.rest.suite', 'mixed_cluster'
+    systemProperty 'tests.upgrade_from_version', version.toString()
     systemProperty 'tests.first_round', 'true'
     finalizedBy "${baseName}#oldClusterTestCluster#node1.stop"
   }
@@ -108,6 +110,7 @@ for (Version version : bwcVersions.wireCompatible) {
   Task twoThirdsUpgradedTestRunner = tasks.getByName("${baseName}#twoThirdsUpgradedTestRunner")
   twoThirdsUpgradedTestRunner.configure {
     systemProperty 'tests.rest.suite', 'mixed_cluster'
+    systemProperty 'tests.upgrade_from_version', version.toString()
     systemProperty 'tests.first_round', 'false'
     finalizedBy "${baseName}#oldClusterTestCluster#node2.stop"
   }
@@ -121,6 +124,7 @@ for (Version version : bwcVersions.wireCompatible) {
   Task upgradedClusterTestRunner = tasks.getByName("${baseName}#upgradedClusterTestRunner")
   upgradedClusterTestRunner.configure {
     systemProperty 'tests.rest.suite', 'upgraded_cluster'
+    systemProperty 'tests.upgrade_from_version', version.toString()
     /*
      * Force stopping all the upgraded nodes after the test runner
      * so they are alive during the test.

qa/rolling-upgrade/src/test/java/org/elasticsearch/upgrades/AbstractRollingTestCase.java

@@ -18,6 +18,7 @@
  */
 package org.elasticsearch.upgrades;
 
+import org.elasticsearch.Version;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.test.rest.ESRestTestCase;
 
@@ -42,6 +43,7 @@ public static ClusterType parse(String value) {
     }
 
     protected static final ClusterType CLUSTER_TYPE = ClusterType.parse(System.getProperty("tests.rest.suite"));
+    protected static final Version UPGRADE_FROM_VERSION = Version.fromString(System.getProperty("tests.upgrade_from_version"));
 
     @Override
     protected final boolean preserveIndicesUponCompletion() {

qa/rolling-upgrade/src/test/java/org/elasticsearch/upgrades/MappingIT.java

@@ -0,0 +1,57 @@
+/*
+ * Licensed to Elasticsearch under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.elasticsearch.upgrades;
+
+import org.elasticsearch.Version;
+import org.elasticsearch.client.Request;
+import org.elasticsearch.client.Response;
+import org.elasticsearch.common.xcontent.support.XContentMapValues;
+
+public class MappingIT extends AbstractRollingTestCase {
+    /**
+     * Create a mapping that explicitly disables the _all field (possible in 6x, see #37429)
+     * and check that it can be upgraded to 7x.
+     */
+    public void testAllFieldDisable6x() throws Exception {
+        assumeTrue("_all", UPGRADE_FROM_VERSION.before(Version.V_7_0_0));
+        switch (CLUSTER_TYPE) {
+            case OLD:
+                Request createTestIndex = new Request("PUT", "all-index");
+                createTestIndex.addParameter("include_type_name", "false");
+                createTestIndex.setJsonEntity(
+                    "{ \"settings\": { \"index.number_of_shards\": 1 }, " +
+                        "\"mappings\": {\"_all\": { \"enabled\": false }, \"properties\": { \"field\": { \"type\": \"text\" }}}}"
+                );
+                createTestIndex.setOptions(expectWarnings("[_all] is deprecated in 6.0+ and will be removed in 7.0. As a replacement," +
+                    " " + "you can use [copy_to] on mapping fields to create your own catch all field."));
+                Response resp = client().performRequest(createTestIndex);
+                assertEquals(200, resp.getStatusLine().getStatusCode());
+                break;
+
+            default:
+                final Request request = new Request("GET", "all-index");
+                Response response = client().performRequest(request);
+                assertEquals(200, response.getStatusLine().getStatusCode());
+                Object enabled = XContentMapValues.extractValue("all-index.mappings._all.enabled", entityAsMap(response));
+                assertNotNull(enabled);
+                assertEquals(false, enabled);
+                break;
+        }
+    }
+}