Date format In elastic

Elastic Stack Elasticsearch
1

I have set up a field mapping in the index with following format
"date_field": { "format": "strict_date_optional_time", "ignore_malformed": true, "type": "date" }

The Index also accepts documents with value for this field as 9.2/10

and all of the following

["9.1/10","9.1.10","9.1","9/1/10","9"]

Is it a valid format for this field ? Is there a way to restrict it to more like a date looking format.

2

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