Custom Logs integration upgrade fails with invalid_index_template_exception

When trying to upgrade the custom logs integration, for fleet from version 2.0.0 to 2.3.0.
Kibana gives the following error:
invalid_index_template_exception: index_template [logs-ERMP@custom] invalid, cause [Validation Failed: 1: name must be lower cased;]]

the index_template dos not exist but for some reason this integration still references it, It did exist over a year ago and was made by mistake with the uppercase. Is there anyway to remove the reference to this index template so the upgrade can continue? I have ensured there is no component or index template named "logs-ERMP@custom" it seems as if something in the integration is still holding onto the information.

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