code: private boolean updateGroup(String groupId, GroupConfig groupConfig) {
          return client
              .updateGroup(
                  groupId,
                  converter.createUpdateGroupRequest(
                      groupConfig,
                      groupConfig.getParentGroup() != null ? idByRef(groupConfig.getParentGroup()) : null,
                      groupConfig.getCustomFields() == null || groupConfig.getCustomFields().size() == 0 ?
                          null : client.getCustomFields())
              );
      }
docs: Update group
  @param groupId group id to update
  @param groupConfig group config
  @return <tt>true</tt> if update was successful, <br/>
  <tt>false</tt> otherwise