feat: add debug query output to elasticsearch_query (#9827)

plugins/inputs/elasticsearch_query/aggregation_query.go

@@ -2,6 +2,7 @@ package elasticsearch_query
 
 import (
 	"context"
+	"encoding/json"
 	"fmt"
 	"strings"
 	"time"
@@ -34,6 +35,16 @@ func (e *ElasticsearchQuery) runAggregationQuery(ctx context.Context, aggregatio
 	query = query.Filter(elastic5.NewQueryStringQuery(filterQuery))
 	query = query.Filter(elastic5.NewRangeQuery(aggregation.DateField).From(from).To(now))
 
+	src, err := query.Source()
+	if err != nil {
+		return nil, fmt.Errorf("failed to get query source - %v", err)
+	}
+	data, err := json.Marshal(src)
+	if err != nil {
+		return nil, fmt.Errorf("failed to unmarshal response - %v", err)
+	}
+	e.Log.Debugf("{\"query\": %s}", string(data))
+
 	search := e.esClient.Search().Index(aggregation.Index).Query(query).Size(0)
 
 	// add only parent elastic.Aggregations to the search request, all the rest are subaggregations of these