Merged PR 1198: Bug 1501: Dead Letter Queue count very high for azure en-queue function.

This is Part 1 of Bug 1501: Dead Letter Queue count very high for azure en-queue function.
os-indexer-azure is emitting a message that contains invalid JSON. The fix is to use `gson.toJson (recordChangedMessages)`.

Related work items: #1591

provider/indexer-azure/src/main/java/org/opengroup/osdu/indexer/azure/publish/PublisherImpl.java

@@ -61,8 +61,9 @@ public class PublisherImpl implements IPublisher {
         Message message = new Message();
 
         RecordChangedMessages recordChangedMessages = getRecordChangedMessage(headers, indexerBatchStatus);
-
-        message.setBody(recordChangedMessages.toString().getBytes(StandardCharsets.UTF_8));
+        Gson gson = new GsonBuilder().create();
+        String json = gson.toJson(recordChangedMessages);
+        message.setBody(json.getBytes(StandardCharsets.UTF_8));
         message.setContentType("application/json");
 
         try {