Requested Backend changes, added details to popover description for the offset field

pkg/tsdb/elasticsearch/client/models.go

@@ -240,6 +240,7 @@ type DateHistogramAgg struct {
 	Missing        *string         `json:"missing,omitempty"`
 	ExtendedBounds *ExtendedBounds `json:"extended_bounds"`
 	Format         string          `json:"format"`
+	Offset         string          `json:"offset,omitempty"`
 }
 
 // FiltersAggregation represents a filters aggregation

pkg/tsdb/elasticsearch/time_series_query.go

@@ -134,6 +134,9 @@ func addDateHistogramAgg(aggBuilder es.AggBuilder, bucketAgg *BucketAgg, timeFro
 			a.Interval = "$__interval"
 		}
 
+		if bucketAgg.Settings.Get("offset").MustString("") != "" {
+			a.Offset = bucketAgg.Settings.Get("offset").MustString("")
+		}
 		if missing, err := bucketAgg.Settings.Get("missing").String(); err == nil {
 			a.Missing = &missing
 		}