Replaces the original concept of the document partitioner by returning the
minimal region that includes all partition changes caused by the invocation
of the document partitioner.
documentChanged2 is considered the replacement of
documentChanged2The document has been changed. The partitioner updates the document's partitioning and returns the minimal region that comprises all partition changes caused in response to the given document event. This method returns
nullif the partitioning did not change.
Will be called by the connected document and is not intended to be used by clients other than the connected document.
event- the event describing the document change
- the region of the document in which the partition type changed or