Fix delete local model twice quickly get 500 response issue (#2806)

Signed-off-by: zane-neo <[email protected]>
(cherry picked from commit 1071a48)

plugin/src/main/java/org/opensearch/ml/action/models/DeleteModelTransportAction.java

@@ -185,7 +185,7 @@ protected void doExecute(Task task, ActionRequest request, ActionListener<Delete
     @VisibleForTesting
     void deleteModelChunks(String modelId, Boolean isHidden, ActionListener<Boolean> actionListener) {
         DeleteByQueryRequest deleteModelsRequest = new DeleteByQueryRequest(ML_MODEL_INDEX);
-        deleteModelsRequest.setQuery(new TermsQueryBuilder(MODEL_ID_FIELD, modelId));
+        deleteModelsRequest.setQuery(new TermsQueryBuilder(MODEL_ID_FIELD, modelId)).setRefresh(true);
 
         client.execute(DeleteByQueryAction.INSTANCE, deleteModelsRequest, ActionListener.wrap(r -> {
             if ((r.getBulkFailures() == null || r.getBulkFailures().size() == 0)