Property MergeFactor

Gets or sets the number of segments that are merged at once and also controls the total number of segments allowed to accumulate in the index.

Determines how often segment indices are merged by addDocument(). With smaller values, less RAM is used while indexing, and searches on unoptimized indices are faster, but indexing speed is slower. With larger values, more RAM is used during indexing, and while searches on unoptimized indices are slower, indexing is faster. Thus larger values (> 10) are best for batch index creation, and smaller values (< 10) for indices that are interactively maintained.

Note that this method is a convenience method: it just calls mergePolicy.setMergeFactor as long as mergePolicy is an instance of Lucene.Net.Index.IndexWriter.LogMergePolicy. Otherwise an IllegalArgumentException is thrown.

This must never be less than 2. The default value is 10.