Lucene.Net.Index.IndexWriter.CommitMerge C# (CSharp) Method

		private bool CommitMerge(MergePolicy.OneMerge merge, SegmentMerger merger, int mergedDocCount, SegmentReader mergedReader)
		{
			lock (this)
			{
				
				System.Diagnostics.Debug.Assert(TestPoint("startCommitMerge"));
				
				if (hitOOM)
				{
					throw new System.SystemException("this writer hit an OutOfMemoryError; cannot complete merge");
				}
				
				if (infoStream != null)
					Message("commitMerge: " + merge.SegString(directory) + " index=" + SegString());
				
				System.Diagnostics.Debug.Assert(merge.registerDone);
				
				// If merge was explicitly aborted, or, if rollback() or
				// rollbackTransaction() had been called since our merge
				// started (which results in an unqualified
				// deleter.refresh() call that will remove any index
				// file that current segments does not reference), we
				// abort this merge
				if (merge.IsAborted())
				{
					if (infoStream != null)
						Message("commitMerge: skipping merge " + merge.SegString(directory) + ": it was aborted");
					
					return false;
				}
				
				int start = EnsureContiguousMerge(merge);
				
				CommitMergedDeletes(merge, mergedReader);
				docWriter.RemapDeletes(segmentInfos, merger.GetDocMaps(), merger.GetDelCounts(), merge, mergedDocCount);

                // If the doc store we are using has been closed and
                // is in now compound format (but wasn't when we
                // started), then we will switch to the compound
                // format as well:
                SetMergeDocStoreIsCompoundFile(merge);
				
				merge.info.HasProx = merger.HasProx();
				
				segmentInfos.RemoveRange(start, start + merge.segments.Count - start);
				System.Diagnostics.Debug.Assert(!segmentInfos.Contains(merge.info));
				segmentInfos.Insert(start, merge.info);

                CloseMergeReaders(merge, false);
				
				// Must note the change to segmentInfos so any commits
				// in-flight don't lose it:
				Checkpoint();
				
				// If the merged segments had pending changes, clear
				// them so that they don't bother writing them to
				// disk, updating SegmentInfo, etc.:
				readerPool.Clear(merge.segments);

                if (merge.optimize)
                {
                    // cascade the optimize:
                    segmentsToOptimize.Add(merge.info);
                }
				return true;
			}
		}