curam.searchserver.luceneadaptor.searcher.pool.mergefactor
This property has an impact on RAM used while updating an index. The index requires updating as a result of search affecting application data updates. For small values(less than 10), searches will be faster, however, search index updates will be slower. With larger values(greater than 10), more RAM is used during index updating, and while searches are slower, index updating is faster. The default value is 10; If the search performance is most important this value should be less than 10 or else if the search data updating performance is more important then the value should be greater than 10.