What is the meaning of {id:.+} in a Spring MVC requestmapping handler method?

I came across a method in the controller. What is this id:.+ ??

@RequestMapping(value="/index/{endpoint}/{type}/{id:.+}", method=RequestMethod.POST, consumes=kContentType, produces=kProducesType)
@ResponseBody
public String indexData(@PathVariable(value="endpoint") String endpoint, @PathVariable(value="type") String type, @PathVariable(value="id") String id, @RequestBody String body, HttpServletRequest request) {
    logger.debug("In web controller for endpoint " + endpoint);
    return indexController.indexData(endpoint, type, id, body,  getSecurityContextProvider(request));
}