The Kibana index pattern fetches these fields from the mapping of your indices. You have to delete and re-index the indices still containing the field with the updated mapping. Then you can go to the index pattern management page in Kibana and refresh the index pattern there using the reload button in the top right. This should remove the fields from the index pattern as well.
Visualizations, dashboards and scripted fields are stored in the special .kibana index, not along with your data. Doing this will not change the saved objects. You just have to makes sure to put the updated index under the same name after you are done.
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