Fix existing tests by defaulting skip_un to false

Author: smalyshev

x-pack/plugin/esql/qa/server/multi-clusters/src/javaRestTest/java/org/elasticsearch/xpack/esql/ccq/Clusters.java

@@ -31,6 +31,10 @@ public static ElasticsearchCluster remoteCluster() {
     }
 
     public static ElasticsearchCluster localCluster(ElasticsearchCluster remoteCluster) {
+        localCluster(remoteCluster, false);
+    }
+
+    public static ElasticsearchCluster localCluster(ElasticsearchCluster remoteCluster, Boolean skipUnavailable) {
         return ElasticsearchCluster.local()
             .name(LOCAL_CLUSTER_NAME)
             .distribution(DistributionType.DEFAULT)
@@ -40,6 +44,7 @@ public static ElasticsearchCluster localCluster(ElasticsearchCluster remoteClust
             .setting("xpack.license.self_generated.type", "trial")
             .setting("node.roles", "[data,ingest,master,remote_cluster_client]")
             .setting("cluster.remote.remote_cluster.seeds", () -> "\"" + remoteCluster.getTransportEndpoint(0) + "\"")
+            .setting("cluster.remote.remote_cluster.skip_unavailable", skipUnavailable.toString())
             .setting("cluster.remote.connections_per_cluster", "1")
             .shared(true)
             .setting("cluster.routing.rebalance.enable", "none")