elasticsearch – Im reaching the field limit on elastic search but when I look in Kibana it seems like I still have a lot of room for fields

Importing some admittedly large json documents in Elastic search and getting the error Limit of total fields [1000] has been exceeded while adding new fields [447]
When I look at the table in kibana on the index patterns page I see fields that seem to be unnecessary.
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My question is it looks like a keyword field and a text field are added for the same value.
In the json it looks similar to the following

    software_version: '234233'

Why would two fields be dedicated to serial_number and software_version.

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