In https://github.com/PointCloudLibrary/pcl/commit/ad00c7bee2fad0391649479d90eee4461a2e74e7, the vertices field of pcl::Vertices changed from std::vector<std::uint32_t> to std::vector<pcl::index_t>, where index_t is an index type with configurable size (currently by default int). This commit makes conversions from and to pcl_msgs::Vertices possible again, moving the vector contents if possible.
Markus Vieth