Github user nickwallen commented on a diff in the pull request:

    https://github.com/apache/metron/pull/1190#discussion_r216739478
  
    --- Diff: 
metron-platform/metron-solr/src/main/java/org/apache/metron/solr/dao/SolrUpdateDao.java
 ---
    @@ -149,21 +151,21 @@ public void addCommentToAlert(CommentAddRemoveRequest 
request, Document latest)
     
         Document newVersion = new Document(latest);
         newVersion.getDocument().put(COMMENTS_FIELD, commentStrs);
    -    update(newVersion, Optional.empty());
    +    return update(newVersion, Optional.empty());
       }
     
       @Override
    -  public void removeCommentFromAlert(CommentAddRemoveRequest request)
    +  public Document removeCommentFromAlert(CommentAddRemoveRequest request)
           throws IOException {
         Document latest = retrieveLatestDao.getLatest(request.getGuid(), 
request.getSensorType());
    -    removeCommentFromAlert(request, latest);
    +    return removeCommentFromAlert(request, latest);
       }
     
       @Override
    -  public void removeCommentFromAlert(CommentAddRemoveRequest request, 
Document latest)
    +  public Document removeCommentFromAlert(CommentAddRemoveRequest request, 
Document latest)
           throws IOException {
         if (latest == null) {
    -      return;
    +      return null;
    --- End diff --
    
    Should we also treat this as an exceptional condition too?


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