docs: public void setIndices(int[] indices)
      {
          if (indices != null)
          {
              if (mIndices == null)
              {
                  setIndexBuffer(new GVRIndexBuffer(getGVRContext(), 4, indices.length));
              }
              mIndices.setIntVec(indices);
          }
          else
          {
              mIndices = null;
              NativeMesh.setIndexBuffer(getNative(), 0L);
          }
      }