Checks if any merges are now necessary and returns a {@link MergePolicy.MergeSpecification} if so. A merge is necessary when there are more than {@link #setMergeFactor} segments at a given level. When multiple levels have too many segments, this method will return multiple merges, allowing the {@link MergeScheduler} to use concurrency.
LogMergePolicy Class | Lucene.Net.Index Namespace