handle rows

Author: idegtiarenko

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/session/EsqlCCSUtils.java

@@ -402,6 +402,9 @@ public static Set<String> getRemotesOf(Set<String> concreteIndices) {
      * This is needed in order to require lookup index is present on every remote in order to correctly execute a query with join.
      */
     public static String qualifyWithRunningRemotes(String index, Set<String> remotes, EsqlExecutionInfo executionInfo) {
+        if (remotes.isEmpty()) {
+            return index;
+        }
         return remotes.stream().filter(remote -> {
             var cluster = executionInfo.getCluster(remote);
             return cluster == null || cluster.getStatus() == Cluster.Status.RUNNING;