_default_ mapping of template is not compatible with index sorting

Elastic Stack Elasticsearch
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version: 6.8.0

we create a _default_ mapping of index template with the index sorting settings.

when we put data to create a new index of this template, then it will throw "unknown index sort field:[${index sort settings field}]"

we find the sources: MapperService.internalMerge() will not merge default mappings into fieldTypes, then the IndexSortConfig.buildIndexSort() would not lookup the field in fieldTypes

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Any helpful info for this?

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