remove some more TODOs from ParsedAggregation

core/src/main/java/org/elasticsearch/search/aggregations/ParsedAggregation.java

@@ -33,7 +33,6 @@
  */
 public abstract class ParsedAggregation implements Aggregation, ToXContent {
 
-    //TODO move CommonFields out of InternalAggregation
     protected static void declareCommonFields(ObjectParser<? extends ParsedAggregation, Void> objectParser) {
         objectParser.declareObject((parsedAgg, metadata) -> parsedAgg.metadata = Collections.unmodifiableMap(metadata),
                 (parser, context) -> parser.map(), InternalAggregation.CommonFields.META);
@@ -60,10 +59,7 @@ public final Map<String, Object> getMetaData() {
     //TODO it may make sense to move getType to the Aggregation interface given that we are duplicating it in both implementations
     protected abstract String getType();
 
-    //TODO the only way to avoid duplicating this method is making Aggregation extend ToXContent
-    //and declare toXContent as a default method in it. Doesn't sound like the right thing to do.
     public XContentBuilder toXContent(XContentBuilder builder, ToXContent.Params params) throws IOException {
-        //TODO move TYPED_KEYS_DELIMITER constant out of InternalAggregation
         // Concatenates the type and the name of the aggregation (ex: top_hits#foo)
         builder.startObject(String.join(InternalAggregation.TYPED_KEYS_DELIMITER, getType(), name));
         if (this.metadata != null) {