Adding upstream version 1.34.4.

Signed-off-by: Daniel Baumann <daniel@debian.org>

plugins/inputs/opensearch_query/aggregation.metric.go

@@ -0,0 +1,18 @@
+package opensearch_query
+
+import "fmt"
+
+type metricAggregationRequest map[string]*aggregationFunction
+
+func (m metricAggregationRequest) addAggregation(name, aggType, field string) error {
+	if t := getAggregationFunctionType(aggType); t != "metric" {
+		return fmt.Errorf("aggregation function %q not supported", aggType)
+	}
+
+	m[name] = &aggregationFunction{
+		aggType: aggType,
+		field:   field,
+	}
+
+	return nil
+}