Expert: returns an IndexReader reading the index in the given Directory, with a custom {@link IndexDeletionPolicy}. You should pass readOnly=true, since it gives much better concurrent performance, unless you intend to do write operations (delete documents or change norms) with the reader.

public static IndexReader Open(
	Directory directory,
	IndexDeletionPolicy deletionPolicy,
	bool readOnly
)

Public Shared Function Open ( _
	directory As Directory, _
	deletionPolicy As IndexDeletionPolicy, _
	readOnly As Boolean _
) As IndexReader

public:
static IndexReader^ Open(
	Directory^ directory, 
	IndexDeletionPolicy^ deletionPolicy, 
	bool readOnly
)