### Elasticsearch Version

8.2.0

### Installed Plugins

_No response_

### Java Version

_bundled_

### OS Version

docker-image = docker.elastic.co/elasticsearch/elasticsearch:8.2.0

### Problem Description

We are trying to migrate from Elasticsearch 6.7.1 to Elasticsearch 8.2.0.

With the same amount of documents per bulk request (100 docs per request), we always get a socket timeout in Elasticsearch 8.2.0. Everything works fine in Elasticsearch 6.7.1.

I noticed that indexing the same document in Elasticsearch 8.2.0 takes 44152ms. In Elasticsearch 6.7.1, indexing takes 50ms.

### Steps to Reproduce

[elasticsearch_8.2.0.txt](https://github.com/elastic/elasticsearch/files/8754299/elasticsearch_8.2.0.txt)
[elasticsearch_6.7.1.txt](https://github.com/elastic/elasticsearch/files/8754300/elasticsearch_6.7.1.txt)



### Logs (if relevant)

_No response_
server/src/main/java/org/elasticsearch/index/mapper/DocumentParser.java
throwOnCopyToOnObject(mapper, copyToFields);
                    }
                    parseCopyFields(context, copyToFields);
                }
            }
        } else if (mapper instanceof FieldAliasMapper) {
            throwOnCopyToOnFieldAlias(context, mapper);
        } else {
            throwOnUnrecognizedMapperType(mapper);
        }
    }
    private static void throwOnUnrecognizedMapperType(Mapper mapper) {
        throw new IllegalStateException(
            "The provided mapper [" + mapper.name() + "] has an unrecognized type [" + mapper.getClass().getSimpleName() + "]."
        );
    }
    private static void throwOnCopyToOnFieldAlias(DocumentParserContext context, Mapper mapper) {
        throw new MapperParsingException(
            "Cannot " + (context.isWithinCopyTo() ? "copy" : "write") + " to a field alias [" + mapper.name() + "]."
        );
    }
    private static void throwOnCopyToOnObject(Mapper mapper, List<String> copyToFields) {
        throw new MapperParsingException(
            "Cannot copy field ["
                + mapper.name()
                + "] to fields "
                + copyToFields
                + ". Copy-to currently only works for value-type fields, not objects."
        );
    }