title: How to evolve schema in Janusgraph?
body: <p>I uploaded movie and user data to janusgraph and initially I made index on movieId but, later I realised I need to index movie title as well. I need to do query based on movie title and without indexing movie id, it's giving me warning "Query requires iterating over all vertices". So, I added the code:</p>
  
  <pre><code>JanusGraphManagement mgmt = graph.openManagement();
  PropertyKey title = mgmt.getPropertyKey("title");
  JanusGraphManagement.IndexBuilder movieNameIndexBuilder = mgmt.buildIndex("title", Vertex.class)
              .addKey(title);
  movieNameIndexBuilder.unique();
  JanusGraphIndex movieTitleIndex = movieNameIndexBuilder.buildCompositeIndex();
  mgmt.setConsistency(movieTitleIndex, ConsistencyModifier.LOCK);
  mgmt.commit(); 
  </code></pre>
  
  <p>Still I'm getting the same warning "Query requires iterating over all vertices" when I'm querying on movie title.</p>
  
  <p>Thank you</p>