code: public HColumnDescriptor adapt(com.google.cloud.bigtable.admin.v2.models.ColumnFamily columnFamily) {
      HColumnDescriptor hColumnDescriptor = new HColumnDescriptor(columnFamily.getId());
      GCRule gcRule = columnFamily.getGCRule();
      if(gcRule != null){
        convertGarbageCollectionRule(gcRule.toProto(), hColumnDescriptor);
      }
      return hColumnDescriptor;
    }
docs: Convert a Bigtable {@link com.google.cloud.bigtable.admin.v2.models.ColumnFamily} to an
  HBase {@link HColumnDescriptor}.
  See {@link #convertGarbageCollectionRule(GcRule, HColumnDescriptor)} for more info.
  
  @param columnFamily a {@link com.google.cloud.bigtable.admin.v2.models.ColumnFamily} object.
  @return a {@link org.apache.hadoop.hbase.HColumnDescriptor} object.