### 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/test/java/org/elasticsearch/index/mapper/CopyToMapperTests.java
b.field("doc_values", false);
                            }
                            b.endObject();
                            b.startObject("source");
                            {
                                b.field("type", "long");
                                b.field("doc_values", false);
                                b.startArray("copy_to");
                                {
                                    b.value("target"); 
                                    b.value("n1.target"); 
                                    b.value("n1.n2.target"); 
                                }
                                b.endArray();
                            }
                            b.endObject();
                        }
                        b.endObject();
                    }
                    b.endObject();
                }
                b.endObject();
            }
            b.endObject();
        }));
        ParsedDocument doc = mapper.parse(source(b -> {
            b.startArray("n1");
            {
                b.startObject();
                {