Wrong timestamp displayed in Opensearch dashboards

I am trying to add some documents to my opensearch instance with the Python client SDK like so:

import opensearchpy

host = 'my_remote_host.com'
port = 9200
auth = ('admin', 'admin')

client = opensearchpy.OpenSearch(
    hosts=[{'host': host, 'port': port}],
    http_compress=True,
    http_auth=auth,
    use_ssl=False,
    verify_certs=False,

)

index_name = 'loggerheads'

# Add a document to the index.
document = {
  'timestamp': '2022-02-09 11:11:11.111',
  'message': 'some random ship'
}

response = client.index(
    index = index_name,
    body = document,
    refresh = True
)

I have previously configured my mapping like this:

PUT loggerheads
{
  "mappings": {
    "properties": {
      "timestamp": {
        "type": "date",
        "format": ["YYYY-MM-DD HH:mm:ss.SSS"]
      },
      "message": {
        "type": "text"
      }
    }
  }
}

The timestamp gets displayed wrong: Am I doing something wrong or is this a bug?

Edit

I sent a series of documents to opensearch. The observation is that any date in 2023 is being displayed as 2023-01-02. Furthermore:

2022 -> 2022-01-03
2021 -> 2021-01-04
2020 -> 2019-12-30
2019 -> 2018-12-31
2018 -> 2018-01-01
2017 -> 2017-01-02
2016 -> 2016-01-04
2015 -> 2014-12-29
2014 -> 2013-12-30
2013 -> 2012-12-31
2012 -> 2012-01-02
2011 -> 2011-01-03
2010 -> 2010-01-04

Solution

It looks like there is a problem in the format with uppercase and lowercase. Please try the following.

PUT loggerheads
{
  "mappings": {
    "properties": {
      "timestamp": {
        "type": "date",
        "format": ["yyyy-MM-dd HH:mm:ss.SSS"]
      },
      "message": {
        "type": "text"
      }
    }
  }
}

https://www.elastic.co/guide/en/elasticsearch/reference/current/date.html#multiple-date-formats