Default to timeField if no field is specified in date histogram aggregation #215
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What this PR does / why we need it:
Based on grafana/grafana#60238
In a date_histogram aggregation, the aggregation input a user enters or chooses in the UI is taken into account. Otherwise if none is present, it defaults to the default timeField.
Which issue(s) this PR fixes:
Contributes to #199
Original issue it fixed would be the equivalent of grafana/grafana#8260