IndexSearcher.DirectoryIndexSearcher.object by the metaclass.IndexWriter.IndexWriter.FtsManagerAPI#getPrimaryKeyPropertyForFts() javadoc for detailsSearcherManager.IndexSearcher and SearcherManager.IndexWriter instance.MergePolicy is used for upgrading all existing segments of
an index when calling IndexWriter.forceMerge(int).IndexSearcher got with the IndexSearcherProvider.acquireIndexSearcher() after all
search operations are completedQueryKey