How to query only numeric values in a String field?

Hi there,
I'm looking for a way to filter my query results.

I need to exclude all those results that are not only numbers.

Is there a way to this in "post production"? I'm using elastic as a database and cannot change definitions, only query it.

Please don't post images of text as they are hardly readable and not searchable.

Instead paste the text and format it with </> icon. Check the preview window.

May be you can try a range query with something like key lte "a"?

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