### Elasticsearch Version

8.5.0

### Installed Plugins

_No response_

### Java Version

elastic.co customer

### OS Version

elastic.co customer

### Problem Description

Dynamic mapping eagerly interprets a string with this format `2021-51` as a date field, but then fails to index due to 51 not being a valid month.

Expected behaviour would be to index `2021-51` as a text field.

### Steps to Reproduce

With [dynamic mapping](https://www.elastic.co/guide/en/elasticsearch/reference/current/dynamic-mapping.html) turned on attempt to index this document in a fresh, empty index:

```http
POST /bugreport/_doc
{
  "not_a_date": "2022-51"
}
```

Returned error message is:
```json
{
  "error": {
    "root_cause": [
      {
        "type": "date_time_exception",
        "reason": "date_time_exception: Invalid value for MonthOfYear (valid values 1 - 12): 51"
      }
    ],
    "type": "mapper_parsing_exception",
    "reason": "failed to parse field [not_a_date] of type [date] in document with id 'U1f9Y4YBXO70bNmhk658'. Preview of field's value: '2022-51'",
    "caused_by": {
      "type": "date_time_exception",
      "reason": "date_time_exception: Invalid value for MonthOfYear (valid values 1 - 12): 51"
    }
  },
  "status": 400
}
```

### Logs (if relevant)

Mappings on index `bugreport`

```http
GET /bugreport/_mapping
```

```json
{
  "bugreport": {
    "mappings": {}
  }
}
```
server/src/main/java/org/elasticsearch/index/mapper/DocumentParser.java
if (Regex.simpleMatch(context.indexSettings().getIndexMetadata().getRoutingPaths(), path)) {
            throw new MapperParsingException(
                "All fields matching [routing_path] must be mapped but [" + path + "] was declared as [dynamic: false]"
            );
        }
    }
    /**
     * Creates instances of the fields that the current field should be copied to
     */
    private static void parseCopyFields(DocumentParserContext context, List<String> copyToFields) throws IOException {
        for (String field : copyToFields) {
            
            
            LuceneDocument targetDoc = null;
            for (LuceneDocument doc = context.doc(); doc != null; doc = doc.getParent()) {
                if (field.startsWith(doc.getPrefix())) {
                    targetDoc = doc;
                    break;
                }
            }
            assert targetDoc != null;
            final DocumentParserContext copyToContext = context.createCopyToContext(field, targetDoc);
            innerParseObject(copyToContext, context.root());
        }
    }
    
    private static ObjectMapper.Dynamic dynamicOrDefault(ObjectMapper parentMapper, DocumentParserContext context) {
        ObjectMapper.Dynamic dynamic = parentMapper.dynamic();
        while (dynamic == null) {
            int lastDotNdx = parentMapper.name().lastIndexOf('.');