ES bulk conforming object without _index and _doc values

Example:

{"index":{"_type":"null","_index":"null","_id":"347061370"}}
{"@type":"http://purl.org/dc/terms/BibliographicResource","@context":"https://resources.swissbib.ch/bibliographicResource/context.jsonld","@id":"https://data.swissbib.ch/bibliographicResource/347061370","rdfs:isDefinedBy":"https://data.swissbib.ch/bibliographicResource/347061370/about","dct:language":"http://lexvo.org/id/iso639-3/deu","rdau:P60163":"http://sws.geonames.org/2658434/","dct:contributor":"https://data.swissbib.ch/person/09dc55f1-9692-3f81-a79f-986868b394fe","rdau:P60339":"Walter Rutishauser","rdau:P60333":"[S.l.] : Walter Rutishauser, 1986","dc:format":"1 Fotografie : Positiv","rdau:P60470":"Exaktes Datum: 01.01.1986","work":"347017851","rdau:P60049":"http://rdvocab.info/termList/RDAContentType/1014","rdau:P60050":"http://rdvocab.info/termList/RDAMediaType/1007","dct:issued":"1986","dct:title":"Léon Schlumpf"}