code: @POST
      @Path("fcr:rollback")
      public Response rollback(@PathParam("path") final String externalPath) {
  
          LOGGER.info("Rollback transaction '{}'", externalPath);
          return finalizeTransaction(externalPath, getUserPrincipal(), false);
      }
docs: Rollback a transaction
  
  @param externalPath the external path
  @return 204