escalar
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Make `version` an Option in GetResponse
Essentially, this TODO: https://github.com/Workday/escalar/blob/master/src/main/scala/com/workday/esclient/EsQuery.scala#L332
TODO: version needs to be an Option. If a doc id is not found, version is missing from the get response.
* Today, Jackson is giving us 0 for version when the doc is not found.