[ES] Merge all the CSV types into a single one

[da115115]

As of March 2020, the resulting CSV data files have various formats. Dumping the corresponding content into Elasticsearch (ES) would force to have almost an index per CSV file type, which would slightly defeat the interest of using ES. Rather, it seems better to merge all the CSV file types into a single format, allowing to get a single ES index. Then, every CSV file will be tagged with their respective checking intent. The search and time-series analysis will be much easier.

So, the next step is to merge all the formats of the CSV files.