Null Value Replacement in Mapping does not work using NEST

Elastic Stack Elasticsearch
1

We have ES version 17.14 and have a mapping for our Index:
.Keyword(s => s.Name(c => c.Website).Index(false).NullValue(""))
But if we try to use the update API :

 var result = await client.UpdateAsync<object>(post.Id, u => u
                 .Index("services-posts")
                 .Doc(new
                 {
                    Website = null
                  }

The field keeps its original value and does not replace it with the value specified in the mapping.
Any Ideas? Thanks

2

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