Should MergeIndexes call params.add instead of set?

[Wilkes, Chris]

Looking at the code for  
org.apache.solr.client.solrj.request.CoreAdminRequest.MergeIndexes it  
looks like it should use params.add instead of .set:

 if (indexDirs != null)  {
        for (String indexDir : indexDirs) {
          params.set(CoreAdminParams.INDEX_DIR, indexDir);
        }
      }
I haven't tested it out to see if the server actually does index all  
of the indexDir=... params sent in on one line so maybe this does  
already work.

Chris