HashGroupingOperator has been updated to close inbound pages. Ordinals needs to do similar.
x-pack/plugin/esql/compute/src/main/java/org/elasticsearch/compute/operator/OrdinalsGroupingOperator.java
/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0; you may not use this file except in compliance with the Elastic License
 * 2.0.
 */
package org.elasticsearch.compute.operator;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.index.SortedSetDocValues;
import org.apache.lucene.util.BytesRef;
import org.apache.lucene.util.BytesRefBuilder;
import org.apache.lucene.util.PriorityQueue;
import org.elasticsearch.common.util.BigArrays;
import org.elasticsearch.common.util.BitArray;
import org.elasticsearch.compute.Describable;
import org.elasticsearch.compute.aggregation.GroupingAggregator;
import org.elasticsearch.compute.aggregation.GroupingAggregator.Factory;
import org.elasticsearch.compute.aggregation.GroupingAggregatorFunction;
import org.elasticsearch.compute.aggregation.SeenGroupIds;
import org.elasticsearch.compute.aggregation.blockhash.BlockHash;
import org.elasticsearch.compute.data.Block;
import org.elasticsearch.compute.data.BlockFactory;
import org.elasticsearch.compute.data.BytesRefBlock;
import org.elasticsearch.compute.data.DocBlock;
import org.elasticsearch.compute.data.DocVector;
import org.elasticsearch.compute.data.IntBlock;
import org.elasticsearch.compute.data.IntVector;
import org.elasticsearch.compute.data.Page;