### CI Link

https://gradle-enterprise.elastic.co/s/752jgoui6up4c/tests/:x-pack:plugin:spatial:test/org.elasticsearch.xpack.spatial.index.query.H3LatLonGeometryTests/testIndexPoints?top-execution=1

### Repro line

`./gradlew ':x-pack:plugin:spatial:test' --tests "org.elasticsearch.xpack.spatial.index.query.H3LatLonGeometryTests.testIndexPoints" -Dtests.seed=DFC1C0965EFCD1EB -Dtests.locale=sr-CS -Dtests.timezone=ECT -Druntime.java=17`

Also failed with various other seeds:
* `-Dtests.seed=DFC1C0965EFCD1EB`
* `-Dtests.seed=72BEB29AA48F2C0B`
* `-Dtests.seed=CAF2A0770CD2CC7E`

### Does it reproduce?

Yes

### Applicable branches

main

### Failure history

https://gradle-enterprise.elastic.co/scans/tests?search.timeZoneId=Europe/Stockholm&tests.container=org.elasticsearch.xpack.spatial.index.query.H3LatLonGeometryTests&tests.test=testIndexPoints

### Failure excerpt

    java.lang.AssertionError: expected:<81> but was:<82>
x-pack/plugin/spatial/src/test/java/org/elasticsearch/xpack/spatial/index/query/H3LatLonGeometryTests.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.xpack.spatial.index.query;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.LatLonPoint;
import org.apache.lucene.document.ShapeField;
import org.apache.lucene.geo.GeoEncodingUtils;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.SerialMergeScheduler;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.store.Directory;
import org.elasticsearch.core.IOUtils;
import org.elasticsearch.geo.GeometryTestUtils;
import org.elasticsearch.geometry.Point;
import org.elasticsearch.h3.CellBoundary;
import org.elasticsearch.h3.H3;
import org.elasticsearch.h3.LatLng;
import org.elasticsearch.test.ESTestCase;
public class H3LatLonGeometryTests extends ESTestCase {