curam.searchserver.luceneadaptor.searcher.index.maxmergedocs
This property improves search times for higher values and for lower values gives better results when an index encounters frequent updating. Small values (e.g., less than 10,000) are best if the index is frequently updated, however, search times performance will be impacted. The default is 10000000. If the search performance is most important this value should be large, for example the default value, or else if the search data updating performance is more important then the value should to a small value, for example 10,000.