[support] is it possible to merge attachment search result to core search module

[Johnny Xiao]

I am trying to merge result of swish module to core search result.

I am using module_load_include to include swish.module file, then I call
function swish_search to get the search result.

So far, I have no luck to populate the result from swish.module.  Am I
missing something or this approach is not feasible.

Thanks for any hints or suggestions.