No handler for type [knn_vector]

[benjtlv]

Version: 1.13.2

I installed open distro, installed it on windows using zip, ran .\bin\elasticsearch.bat, I verified the installation.
I try to create an index in Postman using the following query:

PUT: http://localhost:9200/my-knn-index-1
body:
{ "mappings": { "properties": { "my_vector1": { "type": "knn_vector", "dimension": 2 }, "my_vector2": { "type": "knn_vector", "dimension": 4 } } } }

Got:

{ "error": { "root_cause": [ { "type": "mapper_parsing_exception", "reason": "No handler for type [knn_vector] declared on field [my_vector2]" } ], "type": "mapper_parsing_exception", "reason": "Failed to parse mapping [_doc]: No handler for type [knn_vector] declared on field [my_vector2]", "caused_by": { "type": "mapper_parsing_exception", "reason": "No handler for type [knn_vector] declared on field [my_vector2]" } }, "status": 400 }

Kind of strange.

Any input would be appreciated