Provide progress indication when reindexing is being peformed

When reindex property of an oak:QueryIndexDefinition node is set to "true" there is a message logged which says:
29.09.2014 15:04:08.904 INFO [pool-9-thread-3] org.apache.jackrabbit.oak.plugins.index.IndexUpdate Reindexing would be performed for following indexes [/oak:index/searchFacets]

However, after that, there is no indication of progress for this reindexing.

The only way to determine if the reindexing is progressing is to check back and see that the reindex property on your oak:QueryIndexDefinition node is now set to false.

If something goes wrong with the reindexing it is hard to know if the reindexing is happening at all.

If there could be some logging to indicate that this reindexing is happening successfully and how complete it is, it would be of a great help while troubleshooting indexing problems.