Not sure if this is a feature request, or is something that I missed (like a parameter in the Request that can enable this):
The JSON body returned by a ~/_bulk POST will include fairly rich info in the items[] array, but parsing that is relatively expensive when one is interested only in the number of failures in a large batch.
{
"took": 7,
"errors": false,
"items": [
{
"create": {
"_index": "test_integration_idx",
. . .
]
}