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Dots in the column names cause an error in the ingest pipeline, as dots are special characters in ingest pipeline. This PR changes dots into underscores in CSV field names suggested by the ML find_file_structure endpoint _unless_ the field names are specifically overridden. The reason for allowing them in overrides is that fields that are not mentioned in the ingest pipeline can contain dots. But it's more consistent that the default behaviour is to replace them all. Fixes elastic/kibana#26800
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