[DOCS] Note bulk API supports `application/json` content type (#73949)
[DOCS] Note bulk API supports `application/json` content type (#73949)

The bulk API supports a `Content-Type` header of `application/json` or
`application/x-ndjson`.

Closes #26280
GlenRSmith/elasticsearch,GlenRSmith/elasticsearch,GlenRSmith/elasticsearch,GlenRSmith/elasticsearch,GlenRSmith/elasticsearch