Use right capability check for FORK with CCS (#134428)

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/parser/LogicalPlanBuilder.java

@@ -753,7 +753,7 @@ public class LogicalPlanBuilder extends ExpressionBuilder {
         }
 
         return input -> {
-            if (EsqlCapabilities.Cap.ENABLE_LOOKUP_JOIN_ON_REMOTE.isEnabled() == false) {
+            if (EsqlCapabilities.Cap.ENABLE_FORK_FOR_REMOTE_INDICES.isEnabled() == false) {
                 checkForRemoteClusters(input, source(ctx), "FORK");
             }
             List<LogicalPlan> subPlans = subQueries.stream().map(planFactory -> planFactory.apply(input)).toList();