SettingUpgrader (elasticsearch-extend 3.2 API)

Type Parameters:

T - the type of the underlying setting
```
public interface SettingUpgrader<T>
```
Represents the logic to upgrade a setting.

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`String`	`getKey(String key)`	The logic to upgrade the setting key, for example by mapping the old setting key to the new setting key.
`default List<String>`	`getListValue(List<String> value)`
`Setting<T>`	`getSetting()`	The setting upgraded by this upgrader.
`default String`	`getValue(String value)`	The logic to upgrade the setting value.

- Method Detail
  - getSetting
```
Setting<T> getSetting()
```
    The setting upgraded by this upgrader.
    
    Returns:
    
    the setting
  - getKey
```
String getKey(String key)
```
    The logic to upgrade the setting key, for example by mapping the old setting key to the new setting key.
    
    Parameters:
    
    key - the setting key to upgrade
    
    Returns:
    
    the upgraded setting key
  - getValue
```
default String getValue(String value)
```
    The logic to upgrade the setting value.
    
    Parameters:
    
    value - the setting value to upgrade
    
    Returns:
    
    the upgraded setting value
  - getListValue
```
default List<String> getListValue(List<String> value)
```