Update dataset import to use bulk api now all the documents are nested under a doc field

I switched up my importing of a csv file from doing single inserts to a
bulk insert but I'm not sure why all my document are nested in a doc field
instead of inserted as value. There is no 'doc' field in the dataset so I'm
not sure where that value is coming from.

"hits": [
"_index": "sample-index",
"_type": "sample_agg1_v3",
"_id": "75a6c925-d37e-49fd-b1ca-3c5355e2d146",
"_score": 1,
"_source": {
"doc": "{' ............. the data

instead of

"hits": [
"_index": "sample-index",
"_type": "agg1_sample",
"_id": "83abd750-54d9-4373-8710-5eff29485c9e",
"_score": 1,
"_source": { .... the data

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