Update_by_query updating only one field

I have an index called "shipments" and it has a STA_CD. I would like to perform an update using CURL to update all documents with STA_CD = "OH" to STA_CD="FL". I'm having a lot of problems with the syntax.
Here's what I'm starting with but I'm not getting any matches:

curl -X POST "localhost:9200/shipments/_update_by_query" -H 'Content-Type: application/json' -d'
"script":"ctx._source.STO_STA_CD = 'AK'"

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