fix typo

Author: idegtiarenko

x-pack/plugin/esql-core/src/main/java/org/elasticsearch/xpack/esql/core/tree/Node.java

@@ -68,7 +68,7 @@ public List<T> children() {
     public void forEachDown(Consumer<? super T> action) {
         action.accept((T) this);
         // please do not refactor it to a for-each loop to avoid
-        // allocating iterator that performs concurrent modification checks and extra stack traces
+        // allocating iterator that performs concurrent modification checks and extra stack frames
         for (int c = 0, size = children.size(); c < size; c++) {
             children.get(c).forEachDown(action);
         }
@@ -86,7 +86,7 @@ public <E extends T> void forEachDown(Class<E> typeToken, Consumer<? super E> ac
     @SuppressWarnings("unchecked")
     public void forEachUp(Consumer<? super T> action) {
         // please do not refactor it to a for-each loop to avoid
-        // allocating iterator that performs concurrent modification checks and extra stack traces
+        // allocating iterator that performs concurrent modification checks and extra stack frames
         for (int c = 0, size = children.size(); c < size; c++) {
             children.get(c).forEachUp(action);
         }

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/plan/QueryPlan.java

@@ -144,7 +144,7 @@ private static Object doTransformExpression(Object arg, Function<Expression, ? e
             List<Object> transformed = null;
             boolean hasChanged = false;
             // please do not refactor it to a for-each loop to avoid
-            // allocating iterator that performs concurrent modification checks and extra stack traces
+            // allocating iterator that performs concurrent modification checks and extra stack frames
             for (int i = 0, size = c.size(); i < size; i++) {
                 var e = c.get(i);
                 Object next = doTransformExpression(e, traversal);