title: GraphDB WorkBench Similarity Index refresh are disabled when outdated
body: <p>Using the GraphDB workbench, I have built a few Similarity indexes The first is just the default query and two custom ones. These worked fine for the build. Now they have a status of outdated but the refresh feature is disabled, the UI will not allow a click, instead presenting bubble indicating I cant do it. Only the delete feature is allows. Has anyone determined why this happens and how to fix it? This is the 3rd time it has happened. Yes I can drop a rebuild but I would prefer to find out why its happening. The logs do not appear to have anything related to this. </p>
  
  <p>Thanks</p>