Searching using NOT IN

I'm using the below post in Akana and it returns all records with a paymentReasonCode of 426 or 427.

"companyCode": ["10"],
"customerNumber":["52526"],
"searchString":["IN paymentReasonCode.keyword :426,427"]

Is there a way to code NOT IN so I get all records that are NOT 426 or NOT 427?** I have tried these, but they are not working

"searchString":["NOT IN paymentReasonCode.keyword :426,427"],
"searchString":["NOT IN paymentReasonCode.keyword :426,427"],

Hey @mfwstchas,

Can you confirm that your question pertains to the Elastic App Search product? https://www.elastic.co/app-search/.

If so, could you rephrase it? I am not sure I understand what you are asking.

Thank you,

Jason

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