_bulk response for delete operations lack the found field

[ofavre]

When deleting a document the classical way, we get the found field, telling us whether the document was already deleted or not:

$ curl -XDELETE 'localhost:9200/index/type/1'
{"ok":true,"found":true,"_index":"index","_type":"type","_id":"1","_version":2}
# `found` is true

$ curl -XDELETE 'localhost:9200/index/type/1'
{"ok":true,"found":false,"_index":"index","_type":"type","_id":"1","_version":3}
# `found` is now false

When using the _bulk api, we get the same answer, except for the missing found field:

$ curl -XDELETE 'localhost:9200/index/type/1' -d "$(echo -e '{"delete":{"_id":"1"}}\n ')"
{"took":1,"items":[{"delete":{"_index":"index","_type":"type","_id":"1","_version":1,"ok":true}}]}
# `found` is missing

$ curl -XDELETE 'localhost:9200/index/type/1' -d "$(echo -e '{"delete":{"_id":"1"}}\n ')"
{"took":1,"items":[{"delete":{"_index":"index","_type":"type","_id":"1","_version":2,"ok":true}}]}
# `found` is missing