BigtableClusterName { public String getInstanceId() { return instanceId; } @InternalApi("For internal usage only")  BigtableClusterName(String clusterName); @Override String toString(); String getInstanceId(); String getClusterName(); String getClusterId(); String toSnapshotName(String snapshotId);  }
@Test public void getInstanceId() { String clusterName = "projects/proj/instances/inst/clusters/cluster"; Assert.assertEquals("inst", new BigtableClusterName(clusterName).getInstanceId()); }