Hi nicolant,

This will be caused by the Zend_Search_Lucene indexer. What happens is, while it's building the index, it creates 'segment' files which are parts of the index and combines these when they pass a set threshold. You can actually change that threshold using the MergeFactor property of the index when you create it.

There's a mechanism in place in the plugin to let you change this thankfully. Try this code in your _config.php, you need to rebuild your index afterwards to make it take effect:

function create_index_callback() {
	$index = ZendSeachLuceneWrapper::getIndex();
	$index->setMergeFactor(5);
}
ZendSearchLuceneWrapper::addCreateIndexCallback('create_index_callback');

Have a read of this page and a play with MergeFactor values (default is 10, you want to set it lower) and you should be able to get your index working OK =]
http://framework.zend.com/manual/en/zend.search.lucene.index-creation.html

HTH!
Darren

Unfortunately, it doesn't work.

I tried "dev/build" with your code in _config.php:

function create_index_callback() {
$index = ZendSearchLuceneWrapper::getIndex();
$index->setMergeFactor(5);
}
ZendSearchLuceneWrapper::addCreateIndexCallback('create_index_callback');

ZendSearchLuceneSearchable::enable();

and without and results are the same:

.
.
.
Creating database records
.
.
.
SiteTree

Warning: include_once(/home/rafsu476/public_html/sapphire/dev/Log.php) [function.include-once]: failed to open stream: Too many open files in /home/rafsu476/public_html/sapphire/core/Core.php on line 213

Warning: include_once() [function.include]: Failed opening '/home/rafsu476/public_html/sapphire/dev/Log.php' for inclusion (include_path='/home/rafsu476/public_html/sapphire:/home/rafsu476/public_html/sapphire/parsers:/home/rafsu476/public_html/sapphire/thirdparty:.:/usr/lib/php:/usr/local/lib/php:/home/rafsu476/public_html/lucene/thirdparty') in /home/rafsu476/public_html/sapphire/core/Core.php on line 213

Fatal error: Class 'SS_Log' not found in /home/rafsu476/public_html/sapphire/dev/Debug.php on line 245

The "Silverstripe" index folder structure is the same in the both cases (30 files).

Thank you anyway for quick responce. A tried to play with hard-coded value of MergeFactor inside Writer class earlier also without success :-(