private ResponseEntity<?> deleteAllRegionData(String region) {
    securityService.authorize("DATA", "WRITE", region);
    logger.debug("Deleting all data in Region ({})...", region);
    deleteValues(region);
    return new ResponseEntity<>(HttpStatus.OK);
  }
Delete all data in region or just the given keys

@param region gemfire region
@param encodedKeys optional comma separated list of keys
@return JSON document containing result
geode-web-api/src/main/java/org/apache/geode/rest/internal/web/controllers/CommonCrudController.java