test remote publication in bwc test

Signed-off-by: Shivansh Arora <hishiv@amazon.com>

Author: shiv0408

qa/rolling-upgrade/build.gradle

@@ -62,6 +62,12 @@ for (Version bwcVersion : BuildParams.bwcVersions.wireCompatible) {
       setting 'repositories.url.allowed_urls', 'http://snapshot.test*'
       setting 'path.repo', "${buildDir}/cluster/shared/repo/${baseName}"
       setting 'http.content_type.required', 'true'
+      setting 'node.attr.remote_store.routing_table.repository', 'my-fs-repository'
+      setting 'node.attr.remote_store.state.repository', 'my-fs-repository'
+      setting 'node.attr.remote_store.repository.my-fs-repository.type', 'fs'
+      setting 'node.attr.remote_store.repository.my-fs-repository.settings.location', "${buildDir}/cluster/shared/repo/remote_state"
+      setting 'cluster.remote_store.state.enabled', 'true'
+      setting 'cluster.remote_store.publication.enabled', 'true'
     }
   }
 

qa/rolling-upgrade/src/test/java/org/opensearch/upgrades/ClusterStateIT.java

@@ -14,6 +14,21 @@
 import java.util.Map;
 
 public class ClusterStateIT extends AbstractRollingTestCase{
+    @SuppressWarnings("unchecked")
+    public void testRemotePublicationEnabled() throws Exception {
+        Request getSettingRequest =  new Request("GET", "/_cluster/settings");
+        getSettingRequest.addParameter("include_defaults", "true");
+        Response response = client().performRequest(getSettingRequest);
+        assertOK(response);
+        Map<String, Object> responseMap = entityAsMap(response);
+        Map<String, Object> persistentSettings = (Map<String, Object>) responseMap.get("persistent");
+        assertEquals("true", persistentSettings.get("cluster.remote_store.publication.enabled"));
+        Map<String, Object> transientSettings = (Map<String, Object>) responseMap.get("transient");
+        assertEquals("true", transientSettings.get("cluster.remote_store.publication.enabled"));
+        Map<String, Object> defaultsSettings = (Map<String, Object>) responseMap.get("defaults");
+        assertEquals("true", defaultsSettings.get("cluster.remote_store.publication.enabled"));
+    }
+
     public void testTemplateMetadataUpgrades() throws Exception {
         if (CLUSTER_TYPE == ClusterType.OLD) {
             String templateName = "my_template";