### 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
+ mapper.name()
                + "] tried to parse field ["
                + currentFieldName
                + "] as object, but found a concrete value"
        );
    }
    private static void innerParseObject(DocumentParserContext context, ObjectMapper mapper) throws IOException {
        final XContentParser parser = context.parser();
        XContentParser.Token token = parser.currentToken();
        String currentFieldName = null;
        assert token == XContentParser.Token.FIELD_NAME || token == XContentParser.Token.END_OBJECT;
        while (token != XContentParser.Token.END_OBJECT) {
            if (token == null) {
                throwEOF(mapper, context);
            }
            switch (token) {
                case FIELD_NAME:
                    currentFieldName = parser.currentName();
                    if (currentFieldName.isEmpty()) {
                        throw new IllegalArgumentException("Field name cannot be an empty string");
                    }
                    if (currentFieldName.isBlank()) {
                        throwFieldNameBlank(context, currentFieldName);
                    }
                    break;
                case START_OBJECT:
                    parseObject(context, mapper, currentFieldName);
                    break;
                case START_ARRAY:
                    parseArray(context, mapper, currentFieldName);