Serialize report as json.

src/main/kotlin/KafkaTopology.kt

@@ -119,7 +119,7 @@ class KafkaTopology(
         val noRecordId = hasRecordId[1]
 
         noRecordId
-            .mapValues { key, _ -> Report(key, ReportStatus.failure, "No record id found for record $key.") }
+            .mapValues { key, _ -> Report(key, ReportStatus.failure, "No record id found for record $key.").toJson() }
             .to(reportTopic)
 
         return hasRecordId[0]
@@ -136,12 +136,12 @@ class KafkaTopology(
         val noRecordTypeValue = hasRecordTypeValue[1]
 
         noRecordTypeValue
-            .mapValues { key, value ->
+            .mapValues { key, _ ->
                 Report(
                     key,
                     ReportStatus.failure,
                     "No correct record type found for record $key."
-                )
+                ).toJson()
             }
             .to(reportTopic)