there are fields in the documents like _id, _index, _score, _type .
I would like to add custom fields with names starting with an underscore like _myfield to my documents.
Where could I check that my underscored field names won't conflict with the ELK's predefined ones?
BTW I would like to do that because I'd like to sort some more important fields up in the fields list (alphabetical order) when I expand a document in Kibana/Discover
Both of those are possible to create in Elasticsearch, maybe the use of ! might be a clearer indicator that this is not an Elasticsearch meta/reserved field. We don't really have guidelines or best practises around this sort of thing.
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