Merges all segments from an array of indexes into this index.

NOTE: if this method hits an OutOfMemoryError you should immediately close the writer. See above for details.

Merges the provided indexes into this index.

After this completes, the index is optimized.

The provided IndexReaders are not closed.

NOTE: while this is running, any attempts to add or delete documents (with another thread) will be paused until this method completes.

See {@link #AddIndexesNoOptimize(Directory[])} for details on transactional semantics, temporary free space required in the Directory, and non-CFS segments on an Exception.

NOTE: if this method hits an OutOfMemoryError you should immediately close the writer. See above for details.