ZF-1565: Best practice section for Zend_Search_Lucene module
Some 'best practice' recommendations may already be added to Zend_Search_Lucene module documentation.
Don't use 'id' for stored field names.
Some recommendations for MaxBufferedDocs, MaxMergeDocs and MergeFactor settings for different usage modes (indexing, searching, batch indexing, indexing small/large documents).
Shut down index before the end of script (unset index object), so auto-commit will be done before exception mechanism is shut down.