fix: incorrect handling of json_v2 timestamp_path (#10618)

(cherry picked from commit 25e8b45)

plugins/parsers/json_v2/parser.go

@@ -125,7 +125,7 @@ func (p *Parser) Parse(input []byte) ([]telegraf.Metric, error) {
 				}
 
 				var err error
-				p.timestamp, err = internal.ParseTimestamp(c.TimestampFormat, result.Raw, c.TimestampTimezone)
+				p.timestamp, err = internal.ParseTimestamp(c.TimestampFormat, result.String(), c.TimestampTimezone)
 				if err != nil {
 					return nil, err
 				}
@@ -327,7 +327,7 @@ func (p *Parser) expandArray(result MetricNode) ([]telegraf.Metric, error) {
 				err := fmt.Errorf("use of 'timestamp_query' requires 'timestamp_format'")
 				return nil, err
 			}
-			timestamp, err := internal.ParseTimestamp(p.objectConfig.TimestampFormat, result.Raw, p.objectConfig.TimestampTimezone)
+			timestamp, err := internal.ParseTimestamp(p.objectConfig.TimestampFormat, result.String(), p.objectConfig.TimestampTimezone)
 			if err != nil {
 				return nil, err
 			}

plugins/parsers/json_v2/testdata/timestamp_rfc3339/expected.out

@@ -0,0 +1 @@
+file f="value" 1644434944000000000

plugins/parsers/json_v2/testdata/timestamp_rfc3339/input.json

@@ -0,0 +1,4 @@
+{
+    "when": "2022-02-09T19:29:04Z",
+    "f": "value"
+}

plugins/parsers/json_v2/testdata/timestamp_rfc3339/telegraf.conf

@@ -0,0 +1,8 @@
+[[inputs.file]]
+    files = ["./testdata/timestamp_rfc3339/input.json"]
+    data_format = "json_v2"
+    [[inputs.file.json_v2]]
+        timestamp_path = "when"
+        timestamp_format = "rfc3339"
+        [[inputs.file.json_v2.field]]
+            path = "f"