hourOfWeek aggregation attempt results do not match date histogram by hour aggregation

I'm trying to replicate the results of this data histogram aggregation but bucket by hour of week (0 through 168) instead:

"dateByHour": {
      "date_histogram": {
        "field": "event_timestamp",
        "interval": "1h",
        "time_zone": "America/Chicago",
        "min_doc_count": 1

My attempt is delivering similar results for some hours, and results about 5x off for others:

"hourOfWeek": {
    "terms": {
        "script": {
            "lang": "painless",
            "inline": "doc['event_timestamp'].date.dayOfWeek * doc['event_timestamp'].date.hourOfDay"
        "size": 168

Any ideas of what I may be doing incorrectly?

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