Indexing reports are created for indexing and updating operations. Indexing reports can be retrieved from the index using the getIndexingReports method. Reports are stored in the index only while the index is loaded into RAM for use. If you reload the index, the reports will not be restored.
You can configure the maximum number of stored reports using the setMaxIndexingReportCount method of the IndexSettings class. The default value is 5. Learn more about index settings on the page Search index settings....Search for Node.js / Developer Guide / Advanced...