retry on index not found errors

indexer-core/src/main/java/org/opengroup/osdu/indexer/service/IndexerServiceImpl.java

@@ -65,7 +65,7 @@ public class IndexerServiceImpl implements IndexerService {
 
     private static final TimeValue BULK_REQUEST_TIMEOUT = TimeValue.timeValueMinutes(1);
 
-    private static final List<RestStatus> RETRY_ELASTIC_EXCEPTION = new ArrayList<>(Arrays.asList(RestStatus.TOO_MANY_REQUESTS, RestStatus.BAD_GATEWAY, RestStatus.SERVICE_UNAVAILABLE));
+    private static final List<RestStatus> RETRY_ELASTIC_EXCEPTION = new ArrayList<>(Arrays.asList(RestStatus.TOO_MANY_REQUESTS, RestStatus.BAD_GATEWAY, RestStatus.SERVICE_UNAVAILABLE, RestStatus.NOT_FOUND));
 
     private final Gson gson = new GsonBuilder().serializeNulls().create();