### 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.endObject();
                b.startObject("bar").field("type", "text").endObject();
            }
            b.endObject();
        }));
    }
    public void testNestedCopyToMultiField() {
        IllegalArgumentException e = expectThrows(IllegalArgumentException.class, () -> createMapperService(fieldMapping(b -> {
            b.field("type", "nested");
            b.startObject("properties");
            {
                b.startObject("my_field");
                {
                    b.field("type", "keyword");
                    b.field("copy_to", "field.my_field.bar");
                    b.startObject("fields");
                    {
                        b.startObject("bar").field("type", "text").endObject();
                    }
                    b.endObject();
                }
                b.endObject();
            }
            b.endObject();
        })));
        assertEquals("[copy_to] may not be used to copy to a multi-field: [field.my_field.bar]", e.getMessage());
    }
    public void testCopyFromMultiField() {
        Exception e = expectThrows(IllegalArgumentException.class, () -> createDocumentMapper(fieldMapping(b -> {
            b.field("type", "keyword");