### Elasticsearch Version

8.6.0

### Installed Plugins

_No response_

### Java Version

_bundled_

### OS Version

docker-image = docker.elastic.co/elasticsearch/elasticsearch:8.6

### Problem Description

We are trying to migrate from Elasticsearch 6.7.1 to Elasticsearch 8.6.0.

With the same document we always get IndexOutOfBoundsException while trying to fetch innerhits in Elasticsearch 8.6.0. Everything works fine in Elasticsearch 6.7.1.


### Steps to Reproduce

[elasticsearch_6.7.1 (1).txt](https://github.com/elastic/elasticsearch/files/10466823/elasticsearch_6.7.1.1.txt)
[elasticsearch_8.6.0.txt](https://github.com/elastic/elasticsearch/files/10466824/elasticsearch_8.6.0.txt)


### Logs (if relevant)

`{"@timestamp":"2023-01-20T13:39:21.170Z", "log.level": "WARN", "message":"path: /test/_search, params: {index=test}", "ecs.version": "1.2.0","service.name":"ES_ECS","event.dataset":"elasticsearch.server","process.thread.name":"elasticsearch[es01][search][T#10]","log.logger":"rest.suppressed","elasticsearch.cluster.uuid":"T3_Kb_fZTOORKN7Bn5jz2g","elasticsearch.node.id":"fESFHfZ-RxuDaPIIKhOoNA","elasticsearch.node.name":"es01","elasticsearch.cluster.name":"es_alex","error.type":"org.elasticsearch.action.search.SearchPhaseExecutionException","error.message":"all shards failed","error.stack_trace":"Failed to execute phase [query], all shards failed; shardFailures {[fESFHfZ-RxuDaPIIKhOoNA][test][0]: org.elasticsearch.transport.RemoteTransportException: [es01][172.27.0.2:9300][indices:data/read/search[phase/query]]\nCaused by: org.elasticsearch.search.fetch.FetchPhaseExecutionException: Fetch Failed [Error running fetch phase for doc [73]]\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.search.fetch.FetchPhase.buildSearchHits(FetchPhase.java:181)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.search.fetch.FetchPhase.execute(FetchPhase.java:93)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.search.SearchService.executeFetchPhase(SearchService.java:659)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.search.SearchService.executeQueryPhase(SearchService.java:634)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.search.SearchService.lambda$executeQueryPhase$2(SearchService.java:489)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.action.ActionRunnable.lambda$supply$0(ActionRunnable.java:47)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.action.ActionRunnable$2.doRun(ActionRunnable.java:62)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:26)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.common.util.concurrent.TimedRunnable.doRun(TimedRunnable.java:33)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:769)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:26)\n\tat java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)\n\tat java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)\n\tat java.base/java.lang.Thread.run(Thread.java:833)\nCaused by: org.elasticsearch.search.fetch.FetchPhaseExecutionException: Fetch Failed [Error running fetch phase for doc [43]]\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.search.fetch.FetchPhase.buildSearchHits(FetchPhase.java:181)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.search.fetch.FetchPhase.execute(FetchPhase.java:93)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.search.fetch.subphase.InnerHitsPhase.hitExecute(InnerHitsPhase.java:76)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.search.fetch.subphase.InnerHitsPhase$1.process(InnerHitsPhase.java:52)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.search.fetch.FetchPhase.buildSearchHits(FetchPhase.java:177)\n\t... 13 more\nCaused by: java.lang.IndexOutOfBoundsException: Index: 43, Size: 1\n\tat java.base/java.util.Collections$SingletonList.get(Collections.java:4959)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.search.fetch.FetchPhase.prepareNestedHitContext(FetchPhase.java:466)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.search.fetch.FetchPhase.prepareHitContext(FetchPhase.java:312)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.search.fetch.FetchPhase.buildSearchHits(FetchPhase.java:165)\n\t... 17 more\n}\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.action.search.AbstractSearchAsyncAction.onPhaseFailure(AbstractSearchAsyncAction.java:728)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.action.search.AbstractSearchAsyncAction.executeNextPhase(AbstractSearchAsyncAction.java:418)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.action.search.AbstractSearchAsyncAction.onPhaseDone(AbstractSearchAsyncAction.java:760)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.action.search.AbstractSearchAsyncAction.onShardFailure(AbstractSearchAsyncAction.java:512)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.action.search.AbstractSearchAsyncAction$1.onFailure(AbstractSearchAsyncAction.java:349)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.action.ActionListener$Delegating.onFailure(ActionListener.java:92)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.action.ActionListenerResponseHandler.handleException(ActionListenerResponseHandler.java:48)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.action.search.SearchTransportService$ConnectionCountingHandler.handleException(SearchTransportService.java:642)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.transport.TransportService$UnregisterChildTransportResponseHandler.handleException(TransportService.java:1650)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.transport.TransportService$ContextRestoreResponseHandler.handleException(TransportService.java:1390)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.transport.TransportService$DirectResponseChannel.processException(TransportService.java:1512)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.transport.TransportService$DirectResponseChannel.sendResponse(TransportService.java:1487)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.transport.TaskTransportChannel.sendResponse(TaskTransportChannel.java:50)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.action.support.ChannelActionListener.onFailure(ChannelActionListener.java:48)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.action.ActionRunnable.onFailure(ActionRunnable.java:77)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:28)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.common.util.concurrent.TimedRunnable.doRun(TimedRunnable.java:33)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:769)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:26)\n\tat java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)\n\tat java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)\n\tat java.base/java.lang.Thread.run(Thread.java:833)\nCaused by: org.elasticsearch.ElasticsearchException$1: Index: 43, Size: 1\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.ElasticsearchException.guessRootCauses(ElasticsearchException.java:638)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.action.search.AbstractSearchAsyncAction.executeNextPhase(AbstractSearchAsyncAction.java:416)\n\t... 20 more\nCaused by: java.lang.IndexOutOfBoundsException: Index: 43, Size: 1\n\tat java.base/java.util.Collections$SingletonList.get(Collections.java:4959)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.search.fetch.FetchPhase.prepareNestedHitContext(FetchPhase.java:466)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.search.fetch.FetchPhase.prepareHitContext(FetchPhase.java:312)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.search.fetch.FetchPhase.buildSearchHits(FetchPhase.java:165)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.search.fetch.FetchPhase.execute(FetchPhase.java:93)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.search.fetch.subphase.InnerHitsPhase.hitExecute(InnerHitsPhase.java:76)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.search.fetch.subphase.InnerHitsPhase$1.process(InnerHitsPhase.java:52)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.search.fetch.FetchPhase.buildSearchHits(FetchPhase.java:177)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.search.fetch.FetchPhase.execute(FetchPhase.java:93)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.search.SearchService.executeFetchPhase(SearchService.java:659)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.search.SearchService.executeQueryPhase(SearchService.java:634)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.search.SearchService.lambda$executeQueryPhase$2(SearchService.java:489)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.action.ActionRunnable.lambda$supply$0(ActionRunnable.java:47)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.action.ActionRunnable$2.doRun(ActionRunnable.java:62)\n\tat org.elasticsearch.server@8.4.3/org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:26)\n\t... 6 more\n"}`
server/src/main/java/org/elasticsearch/index/mapper/DocumentParser.java
token = parser.nextToken();
        if (token != null) {
            throwNotAtEnd(token);
        }
    }
    private static void throwNotAtEnd(XContentParser.Token token) {
        throw new IllegalArgumentException("Malformed content, found extra data after parsing: " + token);
    }
    private static boolean isEmptyDoc(RootObjectMapper root, XContentParser parser) throws IOException {
        if (root.isEnabled()) {
            final XContentParser.Token token = parser.nextToken();
            switch (token) {
                case END_OBJECT:
                    
                    return true;
                case FIELD_NAME:
                    return false;
                default:
                    throwOnMalformedContent();
            }
        }
        return false;
    }
    private static void throwOnMalformedContent() {
        throw new MapperParsingException(
            "Malformed content, after first object, either the type field or the actual properties should exist"
        );
    }
    private static MapperParsingException wrapInMapperParsingException(SourceToParse source, Exception e) {