async syncGroup({ groupId, generationId, memberId, groupAssignment }) {
    const syncGroup = this.lookupRequest(apiKeys.SyncGroup, requests.SyncGroup)
    return await this[PRIVATE.SEND_REQUEST](
      syncGroup({
        groupId,
        generationId,
        memberId,
        groupAssignment,
      })
    )
  }
@public
@param {object} request
@param {string} request.groupId
@param {number} request.generationId
@param {string} request.memberId
@param {object} request.groupAssignment
@returns {Promise}