graphdb/src/main/java/com/tinkerpop/blueprints/impls/orient/OrientBaseGraph.java
@Override
  public <T extends Element> Set<String> getIndexedKeys(final Class<T> elementClass) {
    makeActive();

    return getIndexedKeys(elementClass, false);
  }
@Override
  public <T extends Element> Set<String> getIndexedKeys(final Class<T> elementClass) {
    makeActive();

    return getIndexedKeys(elementClass, false);
  }
Returns the indexed properties.

@param elementClass the element class that the index is for

@return Set of String containing the indexed properties