Upgrade assistant fails to reindex due to include_in_all field


I'm running ES and Kibana 6.8.0, and using the 7.0 upgrade assistant, I'm trying to reindex some old Logstash indices created in ES 5.x. It fails due to the presence of the include_in_all field in the index mappings:

[mapper_parsing_exception] [include_in_all] is not allowed for indices created on or after version 6.0.0 as [_all] is deprecated. As a replacement, you can use an [copy_to] on mapping fields to create your own catch all field

The indices in question haven't been written in ages, and won't be either. The include_in_all is false in all the cases I've seen. How do I get rid of it altogether?

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