remove unnecessary comments

Author: idegtiarenko

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

@@ -189,13 +189,11 @@ public T transformDown(Function<? super T, ? extends T> rule) {
 
     @SuppressWarnings("unchecked")
     public <E extends T> T transformDown(Class<E> typeToken, Function<E, ? extends T> rule) {
-        // type filtering function
         return transformDown((t) -> (typeToken.isInstance(t) ? rule.apply((E) t) : t));
     }
 
     @SuppressWarnings("unchecked")
     public <E extends T> T transformDown(Predicate<Node<?>> nodePredicate, Function<E, ? extends T> rule) {
-        // type filtering function
         return transformDown((t) -> (nodePredicate.test(t) ? rule.apply((E) t) : t));
     }
 
@@ -208,13 +206,11 @@ public T transformUp(Function<? super T, ? extends T> rule) {
 
     @SuppressWarnings("unchecked")
     public <E extends T> T transformUp(Class<E> typeToken, Function<E, ? extends T> rule) {
-        // type filtering function
         return transformUp((t) -> (typeToken.isInstance(t) ? rule.apply((E) t) : t));
     }
 
     @SuppressWarnings("unchecked")
     public <E extends T> T transformUp(Predicate<Node<?>> nodePredicate, Function<E, ? extends T> rule) {
-        // type filtering function
         return transformUp((t) -> (nodePredicate.test(t) ? rule.apply((E) t) : t));
     }
 

x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/optimizer/OptimizerRulesTests.java

@@ -27,7 +27,6 @@
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
-import java.util.Objects;
 
 import static org.elasticsearch.xpack.esql.EsqlTestUtils.rangeOf;
 import static org.elasticsearch.xpack.esql.core.type.DataType.BOOLEAN;