am seeing Field with Null are still indexing in ES 7.5 but according to ES "A null value cannot be indexed or searched. When a field is set to null". I remember when same field we passed with null on calling buklupdate API it was not indexed in ES 5.5 and only fields specified in mapping are indexed and ignored other fields(not part of mapping) with null even we included on the request.
would be great help if get to know any specific flag to be turned on to resolve this in ES 7.5 ?.
FYI: we set dynamic as strict in mapping. thank you !