ShardOptions (Morphia)

```
@Documented
@Retention(RUNTIME)
@Target(ANNOTATION_TYPE)
@MorphiaExperimental
public @interface ShardOptions
```
Specifies options to be applied when sharding.

Since:

2.3

Developer note.
This is an experimental item. Its function and presence are subject to change. Feedback on features and usability extremely welcome.

- Optional Element Summary
  
  Optional Elements
  Modifier and Type Optional Element Description
  
  int numInitialChunks
  Optional.
  
  boolean presplitHashedZones
  Optional.
  
  boolean unique
  Optional.

- Element Detail
  - numInitialChunks
```
int numInitialChunks
```
    Optional. Specifies the minimum number of chunks to create initially when sharding an empty collection with a hashed shard key.
    
    Returns:
    
    the number of chunks
    
    Default:
    
    -1
- - presplitHashedZones
```
boolean presplitHashedZones
```
    Optional. Specify true to perform initial chunk creation and distribution for an empty or non-existing collection based on the defined zones and zone ranges for the collection. For hashed sharding only.
    
    Returns:
    
    true for presplits
    
    See Also:
    
    ShardKeyType.HASHED
    
    Default:
    
    false
- - unique
```
boolean unique
```
    Optional. Specify true to ensure that the underlying index enforces a unique constraint.
    
    Returns:
    
    true for unique constraints
    
    Default:
    
    false