Word 'class' not found in search

I did look at the Stop list, but it doesn't have the word 'class' in it.  Also, one important fact that I forgot to include is that the server configuration manager for the context being used is set to Reindex Documents at Server which, according to the reference manual, activates the Lucene Search engine.  With that unchecked, the search works pretty much as with the standard WebHelp...however, I was hoping to take advantage of the Lucene search engine if possible.   It would be nice to verify that the word class seems to be ignored by the Lucene engine search since that should be a fairly easy bug to track down and fix. 

On a related issue, it appears that the multiple word search with several merged projects does not give the expected results.  With standard Webhelp (not the Pro version) the search term 'color class' would find the highest rated topic across all merged projects (the main project and the MergedProjects) and return that topic as the top result.  With Webhelp Pro, the results are ranked separately for each project in the merged set, so if the first project doesn't have the 'color class' pair, it still ranks any topic in the first project with either 'color' or 'class' at the top if either word appears in any topic.  In my case, the topic containing the word pair 'color class' appears in the second project in the merged set and appears way down in the results list even though its title (heading1) is 'Color Class'...which does appear as the top topic in a standard WebHelp merged search.