*
     * @param path
     *            The path to the properties file. If {@code null}, a {@link FileAccessException} is thrown.
     * @throws FileAccessException
     *             If the file cannot be accessed or created.
     */
    public DynamicProperties(final String path) {
        this(path == null ? null : new File(path));
    }

    /**

	Birthday     sql.NullTime
	RegisteredAt mytime
	DeletedAt    *mytime
	Active       mybool
	Admin        *mybool
}

type BaseModel struct {
	ID        uint
	CreatedAt time.Time
	CreatedBy *int
	Created   *VersionUser `gorm:"foreignKey:CreatedBy"`
	UpdatedAt time.Time
	DeletedAt gorm.DeletedAt `gorm:"index"`
}

type VersionModel struct {
	BaseModel
	Version int
}

type VersionUser struct {

      "index" : {
        "creation_date" : "1509021053135",
        "number_of_shards" : "5",
        "number_of_replicas" : "1",
        "uuid" : "-gono3d2R0KP5po-ggBr0A",
        "version" : {
          "created" : "6000051"
        },
        "provided_name" : "fess_config.file_authentication"
      }
    }
  }

     * Validates that the associated file config ID is valid before creation.
     *
     * @param body file authentication setting data to create
     * @return JSON response with created setting ID and status
     */
    @Execute
    public JsonResponse<ApiResult> post$setting(final CreateBody body) {
        validateApi(body, messages -> {});
        if (!isValidFileConfigId(body.fileConfigId)) {

      "index" : {
        "creation_date" : "1509021050413",
        "number_of_shards" : "5",
        "number_of_replicas" : "1",
        "uuid" : "Oh0_KGaLRLGjpIm2zjB83Q",
        "version" : {
          "created" : "6000051"
        },
        "provided_name" : "fess_config.crawling_info"
      }
    }
  }

          }
        },
        "creation_date" : "1509021055215",
        "number_of_shards" : "5",
        "number_of_replicas" : "1",
        "uuid" : "Zylt7BsVRhiOasQfUWBg0w",
        "version" : {
          "created" : "6000051"
        },
        "provided_name" : "fess_config.label_type"
      }
    }
  }

      "index" : {
        "creation_date" : "1509021050077",
        "number_of_shards" : "5",
        "number_of_replicas" : "1",
        "uuid" : "AHy84s2vSoamP32r62Jy4Q",
        "version" : {
          "created" : "6000051"
        },
        "provided_name" : "fess_config.boost_document_rule"
      }
    }
  }

      L existing = locks.get(index);
      if (existing != null) {
        return existing;
      }
      L created = supplier.get();
      existing = locks.putIfAbsent(index, created);
      return MoreObjects.firstNonNull(existing, created);
    }

    @Override
    public int size() {
      return size;
    }
  }

  /** A bit mask were all bits are set. */

      "index" : {
        "creation_date" : "1509021051920",
        "number_of_shards" : "5",
        "number_of_replicas" : "1",
        "uuid" : "fP473Sr-RZO2d36NkKGgKQ",
        "version" : {
          "created" : "6000051"
        },
        "provided_name" : "fess_config.duplicate_host"
      }
    }
  }

      "index" : {
        "creation_date" : "1509021057304",
        "number_of_shards" : "5",
        "number_of_replicas" : "1",
        "uuid" : "gofu2g1ATH6L2rVweOWmtg",
        "version" : {
          "created" : "6000051"
        },
        "provided_name" : "fess_config.thumbnail_queue"
      }
    }
  }