### 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();
        }));
        MapperParsingException e = expectThrows(
            MapperParsingException.class,
            () -> docMapper.parse(source(b -> b.field("copy_test", "foo")))
        );
        assertThat(e.getMessage(), startsWith("mapping set to strict, dynamic introduction of [very] within [_doc] is not allowed"));
    }
    public void testCopyToInnerStrictDynamicInnerObjectParsing() throws Exception {
        DocumentMapper docMapper = createDocumentMapper(mapping(b -> {
            b.startObject("copy_test");
            {
                b.field("type", "text");
                b.field("copy_to", "very.far.field");
            }
            b.endObject();
            b.startObject("very");
            {
                b.field("type", "object");
                b.startObject("properties");
                {
                    b.startObject("far");
                    {
                        b.field("type", "object");
                        b.field("dynamic", "strict");
                    }
                    b.endObject();
                }
                b.endObject();
            }